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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=bdb;
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David'), (2, 'Erik'), (3, 'Sasha'), (3, 'Jeremy'), (4, 'Matt');
select id, code, name from t1 order by id;
id code name
1 1 Tim
2 1 Monty
3 2 David
4 2 Erik
5 3 Sasha
6 3 Jeremy
7 4 Matt
update ignore t1 set id = 8, name = 'Sinisa' where id < 3;
select id, code, name from t1 order by id;
id code name
2 1 Monty
3 2 David
4 2 Erik
5 3 Sasha
6 3 Jeremy
7 4 Matt
8 1 Sinisa
update ignore t1 set id = id + 10, name = 'Ralph' where id < 4;
select id, code, name from t1 order by id;
id code name
3 2 David
4 2 Erik
5 3 Sasha
6 3 Jeremy
7 4 Matt
8 1 Sinisa
12 1 Ralph
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0' NOT NULL,
level tinyint(4) DEFAULT '0' NOT NULL,
PRIMARY KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=bdb;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1),(179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id parent_id level
8 102 2
9 102 2
15 102 2
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
ERROR 23000: Duplicate entry '1024' for key 1
select * from t1;
id parent_id level
1001 100 0
1002 101 1
1003 101 1
1004 101 1
1005 101 1
1006 101 1
1007 101 1
1008 102 2
1009 102 2
1015 102 2
1016 103 2
1017 103 2
1018 103 2
1019 103 2
1020 103 2
1021 104 2
1022 104 2
1024 104 2
1025 105 2
1026 105 2
1027 105 2
1028 105 2
1029 105 2
1030 105 2
1031 106 2
1032 106 2
1033 106 2
1034 106 2
1035 106 2
1036 107 2
1037 107 2
1038 107 2
1040 107 2
1157 100 0
1179 105 2
1183 104 2
1193 105 2
1202 107 2
1203 107 2
update ignore t1 set id=id+1;
select * from t1;
id parent_id level
1001 100 0
1002 101 1
1003 101 1
1004 101 1
1005 101 1
1006 101 1
1007 101 1
1008 102 2
1010 102 2
1015 102 2
1016 103 2
1017 103 2
1018 103 2
1019 103 2
1020 103 2
1021 104 2
1023 104 2
1024 104 2
1025 105 2
1026 105 2
1027 105 2
1028 105 2
1029 105 2
1030 105 2
1031 106 2
1032 106 2
1033 106 2
1034 106 2
1035 106 2
1036 107 2
1037 107 2
1039 107 2
1041 107 2
1158 100 0
1180 105 2
1184 104 2
1194 105 2
1202 107 2
1204 107 2
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102 order by parent_id,id;
id parent_id level
1008 102 2
1010 102 2
1015 102 2
explain select level from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const X Using index
explain select level,id from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const X Using index
explain select level,id,parent_id from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const X
select level,id from t1 where level=1;
level id
1 1002
1 1003
1 1004
1 1005
1 1006
1 1007
select level,id,parent_id from t1 where level=1;
level id parent_id
1 1002 101
1 1003 101
1 1004 101
1 1005 101
1 1006 101
1 1007 101
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 PRIMARY 1 id A 39 NULL NULL BTREE
t1 1 parent_id 1 parent_id A 9 NULL NULL BTREE
t1 1 level 1 level A 3 NULL NULL BTREE
drop table t1;
CREATE TABLE t1 (
gesuchnr int(11) DEFAULT '0' NOT NULL,
benutzer_id int(11) DEFAULT '0' NOT NULL,
PRIMARY KEY (gesuchnr,benutzer_id)
) engine=BDB;
replace into t1 (gesuchnr,benutzer_id) values (2,1);
replace into t1 (gesuchnr,benutzer_id) values (1,1);
replace into t1 (gesuchnr,benutzer_id) values (1,1);
select * from t1;
gesuchnr benutzer_id
1 1
2 1
drop table t1;
create table t1 (id int not null primary key, x int not null, key (x)) engine=bdb;
insert into t1 (id, x) values (1, 1);
replace into t1 (id, x) values (1, 2);
select * from t1;
id x
1 2
drop table t1;
create table t1 (a int) engine=bdb;
insert into t1 values (1), (2);
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
delete from t1 where a = 1;
select * from t1;
a
2
check table t1;
Table Op Msg_type Msg_text
test.t1 check note The storage engine for the table doesn't support check
drop table t1;
create table t1 (a int,b varchar(20)) engine=bdb;
insert into t1 values (1,""), (2,"testing");
delete from t1 where a = 1;
select * from t1;
a b
2 testing
create index skr on t1 (a);
insert into t1 values (3,""), (4,"testing");
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 skr 1 a A 3 NULL NULL YES BTREE
drop table t1;
create table t1 (a int,b varchar(20),key(a)) engine=bdb;
insert into t1 values (1,""), (2,"testing");
select * from t1 where a = 1;
a b
1
drop table t1;
create table t1 (a char(10) not null, b int not null auto_increment, primary key(a,b)) engine=BDB;
insert into t1 values ("a",1),("b",2),("a",2),("c",1);
insert into t1 values ("a",NULL),("b",NULL),("c",NULL),("e",NULL);
insert into t1 (a) values ("a"),("b"),("c"),("d");
insert into t1 (a) values ('k'),('d');
insert into t1 (a) values ("a");
insert into t1 values ("d",last_insert_id());
select * from t1;
a b
a 1
a 2
a 3
a 4
a 5
b 2
b 3
b 4
c 1
c 2
c 3
d 1
d 2
d 5
e 1
k 1
flush tables;
select count(*) from t1;
count(*)
16
drop table t1;
create table t1 (n int not null primary key) engine=bdb;
set autocommit=0;
insert into t1 values (4);
rollback;
select n, "after rollback" from t1;
n after rollback
insert into t1 values (4);
commit;
select n, "after commit" from t1;
n after commit
4 after commit
commit;
insert into t1 values (5);
insert into t1 values (4);
ERROR 23000: Duplicate entry '4' for key 1
commit;
select n, "after commit" from t1;
n after commit
4 after commit
5 after commit
set autocommit=1;
insert into t1 values (6);
insert into t1 values (4);
ERROR 23000: Duplicate entry '4' for key 1
select n from t1;
n
4
5
6
rollback;
drop table t1;
create table t1 ( id int NOT NULL PRIMARY KEY, nom varchar(64)) engine=BDB;
begin;
insert into t1 values(1,'hamdouni');
select id as afterbegin_id,nom as afterbegin_nom from t1;
afterbegin_id afterbegin_nom
1 hamdouni
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id afterrollback_nom
set autocommit=0;
insert into t1 values(2,'mysql');
select id as afterautocommit0_id,nom as afterautocommit0_nom from t1;
afterautocommit0_id afterautocommit0_nom
2 mysql
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id afterrollback_nom
set autocommit=1;
drop table t1;
CREATE TABLE t1 (id char(8) not null primary key, val int not null) engine=bdb;
insert into t1 values ('pippo', 12);
insert into t1 values ('pippo', 12);
ERROR 23000: Duplicate entry 'pippo' for key 1
delete from t1;
delete from t1 where id = 'pippo';
select * from t1;
id val
insert into t1 values ('pippo', 12);
set autocommit=0;
delete from t1;
rollback;
select * from t1;
id val
pippo 12
delete from t1;
commit;
select * from t1;
id val
drop table t1;
set autocommit=1;
CREATE TABLE t1 (ID INTEGER NOT NULL PRIMARY KEY, NAME VARCHAR(64)) ENGINE=BDB;
INSERT INTO t1 VALUES (1, 'Jochen');
select * from t1;
ID NAME
1 Jochen
drop table t1;
CREATE TABLE t1 ( _userid VARCHAR(60) NOT NULL PRIMARY KEY) ENGINE=BDB;
set autocommit=0;
INSERT INTO t1 SET _userid='marc@anyware.co.uk';
COMMIT;
SELECT * FROM t1;
_userid
marc@anyware.co.uk
SELECT _userid FROM t1 WHERE _userid='marc@anyware.co.uk';
_userid
marc@anyware.co.uk
drop table t1;
set autocommit=1;
CREATE TABLE t1 (
user_id int(10) DEFAULT '0' NOT NULL,
name varchar(100),
phone varchar(100),
ref_email varchar(100) DEFAULT '' NOT NULL,
detail varchar(200),
PRIMARY KEY (user_id,ref_email)
)engine=bdb;
INSERT INTO t1 VALUES (10292,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10292,'shirish','2333604','shirish@yahoo.com','ddsds'),(10292,'sonali','323232','sonali@bolly.com','filmstar');
select * from t1 where user_id=10292;
user_id name phone ref_email detail
10292 sanjeev 29153373 sansh777@hotmail.com xxx
10292 shirish 2333604 shirish@yahoo.com ddsds
10292 sonali 323232 sonali@bolly.com filmstar
INSERT INTO t1 VALUES (10291,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10293,'shirish','2333604','shirish@yahoo.com','ddsds');
select * from t1 where user_id=10292;
user_id name phone ref_email detail
10292 sanjeev 29153373 sansh777@hotmail.com xxx
10292 shirish 2333604 shirish@yahoo.com ddsds
10292 sonali 323232 sonali@bolly.com filmstar
select * from t1 where user_id>=10292;
user_id name phone ref_email detail
10292 sanjeev 29153373 sansh777@hotmail.com xxx
10292 shirish 2333604 shirish@yahoo.com ddsds
10292 sonali 323232 sonali@bolly.com filmstar
10293 shirish 2333604 shirish@yahoo.com ddsds
select * from t1 where user_id>10292;
user_id name phone ref_email detail
10293 shirish 2333604 shirish@yahoo.com ddsds
select * from t1 where user_id<10292;
user_id name phone ref_email detail
10291 sanjeev 29153373 sansh777@hotmail.com xxx
drop table t1;
CREATE TABLE t1 (a int not null, b int not null,c int not null,
key(a),primary key(a,b), unique(c),key(a),unique(b));
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 PRIMARY 1 a A NULL NULL NULL BTREE
t1 0 PRIMARY 2 b A 0 NULL NULL BTREE
t1 0 c 1 c A 0 NULL NULL BTREE
t1 0 b 1 b A 0 NULL NULL BTREE
t1 1 a 1 a A NULL NULL NULL BTREE
t1 1 a_2 1 a A NULL NULL NULL BTREE
drop table t1;
create table t1 (col1 int not null, col2 char(4) not null, primary key(col1));
alter table t1 engine=BDB;
insert into t1 values ('1','1'),('5','2'),('2','3'),('3','4'),('4','4');
select * from t1;
col1 col2
1 1
2 3
3 4
4 4
5 2
update t1 set col2='7' where col1='4';
select * from t1;
col1 col2
1 1
2 3
3 4
4 7
5 2
alter table t1 add co3 int not null;
select * from t1;
col1 col2 co3
1 1 0
2 3 0
3 4 0
4 7 0
5 2 0
update t1 set col2='9' where col1='2';
select * from t1;
col1 col2 co3
1 1 0
2 9 0
3 4 0
4 7 0
5 2 0
drop table t1;
create table t1 (a int not null , b int, primary key (a)) engine = BDB;
create table t2 (a int not null , b int, primary key (a)) engine = myisam;
insert into t1 VALUES (1,3) , (2,3), (3,3);
select * from t1;
a b
1 3
2 3
3 3
insert into t2 select * from t1;
select * from t2;
a b
1 3
2 3
3 3
delete from t1 where b = 3;
select * from t1;
a b
insert into t1 select * from t2;
select * from t1;
a b
1 3
2 3
3 3
select * from t2;
a b
1 3
2 3
3 3
drop table t1,t2;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
ggid varchar(32) binary DEFAULT '' NOT NULL,
email varchar(64) DEFAULT '' NOT NULL,
passwd varchar(32) binary DEFAULT '' NOT NULL,
PRIMARY KEY (id),
UNIQUE ggid (ggid)
) ENGINE=BDB;
insert into t1 (ggid,passwd) values ('test1','xxx');
insert into t1 (ggid,passwd) values ('test2','yyy');
insert into t1 (ggid,passwd) values ('test2','this will fail');
ERROR 23000: Duplicate entry 'test2' for key 2
insert into t1 (ggid,id) values ('this will fail',1);
ERROR 23000: Duplicate entry '1' for key 1
select * from t1 where ggid='test1';
id ggid email passwd
1 test1 xxx
select * from t1 where passwd='xxx';
id ggid email passwd
1 test1 xxx
select * from t1 where id=2;
id ggid email passwd
2 test2 yyy
replace into t1 (ggid,id) values ('this will work',1);
replace into t1 (ggid,passwd) values ('test2','this will work');
update t1 set id=100,ggid='test2' where id=1;
ERROR 23000: Duplicate entry 'test2' for key 2
select * from t1;
id ggid email passwd
1 this will work
3 test2 this will work
select * from t1 where id=1;
id ggid email passwd
1 this will work
select * from t1 where id=999;
id ggid email passwd
drop table t1;
CREATE TABLE t1 (
user_name varchar(12),
password text,
subscribed char(1),
user_id int(11) DEFAULT '0' NOT NULL,
quota bigint(20),
weight double,
access_date date,
access_time time,
approved datetime,
dummy_primary_key int(11) NOT NULL auto_increment,
PRIMARY KEY (dummy_primary_key)
) ENGINE=BDB;
INSERT INTO t1 VALUES ('user_0','somepassword','N',0,0,0,'2000-09-07','23:06:59','2000-09-07 23:06:59',1);
INSERT INTO t1 VALUES ('user_1','somepassword','Y',1,1,1,'2000-09-07','23:06:59','2000-09-07 23:06:59',2);
INSERT INTO t1 VALUES ('user_2','somepassword','N',2,2,1.4142135623731,'2000-09-07','23:06:59','2000-09-07 23:06:59',3);
INSERT INTO t1 VALUES ('user_3','somepassword','Y',3,3,1.7320508075689,'2000-09-07','23:06:59','2000-09-07 23:06:59',4);
INSERT INTO t1 VALUES ('user_4','somepassword','N',4,4,2,'2000-09-07','23:06:59','2000-09-07 23:06:59',5);
select user_name, password , subscribed, user_id, quota, weight, access_date, access_time, approved, dummy_primary_key from t1 order by user_name;
user_name password subscribed user_id quota weight access_date access_time approved dummy_primary_key
user_0 somepassword N 0 0 0 2000-09-07 23:06:59 2000-09-07 23:06:59 1
user_1 somepassword Y 1 1 1 2000-09-07 23:06:59 2000-09-07 23:06:59 2
user_2 somepassword N 2 2 1.4142135623731 2000-09-07 23:06:59 2000-09-07 23:06:59 3
user_3 somepassword Y 3 3 1.7320508075689 2000-09-07 23:06:59 2000-09-07 23:06:59 4
user_4 somepassword N 4 4 2 2000-09-07 23:06:59 2000-09-07 23:06:59 5
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0' NOT NULL,
level tinyint(4) DEFAULT '0' NOT NULL,
KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=bdb;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1);
INSERT INTO t1 values (179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id parent_id level
8 102 2
9 102 2
15 102 2
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
select * from t1;
id parent_id level
1001 100 0
1003 101 1
1004 101 1
1008 102 2
1024 102 2
1017 103 2
1022 104 2
1024 104 2
1028 105 2
1029 105 2
1030 105 2
1031 106 2
1032 106 2
1033 106 2
1203 107 2
1202 107 2
1020 103 2
1157 100 0
1193 105 2
1040 107 2
1002 101 1
1015 102 2
1006 101 1
1034 106 2
1035 106 2
1016 103 2
1007 101 1
1036 107 2
1018 103 2
1026 105 2
1027 105 2
1183 104 2
1038 107 2
1025 105 2
1037 107 2
1021 104 2
1019 103 2
1005 101 1
1179 105 2
update ignore t1 set id=id+1;
select * from t1;
id parent_id level
1002 100 0
1004 101 1
1005 101 1
1009 102 2
1025 102 2
1018 103 2
1023 104 2
1025 104 2
1029 105 2
1030 105 2
1031 105 2
1032 106 2
1033 106 2
1034 106 2
1204 107 2
1203 107 2
1021 103 2
1158 100 0
1194 105 2
1041 107 2
1003 101 1
1016 102 2
1007 101 1
1035 106 2
1036 106 2
1017 103 2
1008 101 1
1037 107 2
1019 103 2
1027 105 2
1028 105 2
1184 104 2
1039 107 2
1026 105 2
1038 107 2
1022 104 2
1020 103 2
1006 101 1
1180 105 2
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102;
id parent_id level
1009 102 2
1025 102 2
1016 102 2
explain select level from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const X Using index
select level,id from t1 where level=1;
level id
1 1004
1 1005
1 1003
1 1007
1 1008
1 1006
select level,id,parent_id from t1 where level=1;
level id parent_id
1 1004 101
1 1005 101
1 1003 101
1 1007 101
1 1008 101
1 1006 101
select level,id from t1 where level=1 order by id;
level id
1 1003
1 1004
1 1005
1 1006
1 1007
1 1008
delete from t1 where level=1;
select * from t1;
id parent_id level
1002 100 0
1009 102 2
1025 102 2
1018 103 2
1023 104 2
1025 104 2
1029 105 2
1030 105 2
1031 105 2
1032 106 2
1033 106 2
1034 106 2
1204 107 2
1203 107 2
1021 103 2
1158 100 0
1194 105 2
1041 107 2
1016 102 2
1035 106 2
1036 106 2
1017 103 2
1037 107 2
1019 103 2
1027 105 2
1028 105 2
1184 104 2
1039 107 2
1026 105 2
1038 107 2
1022 104 2
1020 103 2
1180 105 2
drop table t1;
CREATE TABLE t1 (
sca_code char(6) NOT NULL,
cat_code char(6) NOT NULL,
sca_desc varchar(50),
lan_code char(2) NOT NULL,
sca_pic varchar(100),
sca_sdesc varchar(50),
sca_sch_desc varchar(16),
PRIMARY KEY (sca_code, cat_code, lan_code),
INDEX sca_pic (sca_pic)
) engine = bdb ;
INSERT INTO t1 ( sca_code, cat_code, sca_desc, lan_code, sca_pic, sca_sdesc, sca_sch_desc) VALUES ( 'PD', 'J', 'PENDANT', 'EN', NULL, NULL, 'PENDANT'),( 'RI', 'J', 'RING', 'EN', NULL, NULL, 'RING'),( 'QQ', 'N', 'RING', 'EN', 'not null', NULL, 'RING');
select count(*) from t1 where sca_code = 'PD';
count(*)
1
select count(*) from t1 where sca_code <= 'PD';
count(*)
1
select count(*) from t1 where sca_pic is null;
count(*)
2
alter table t1 drop index sca_pic, add index sca_pic (cat_code, sca_pic);
select count(*) from t1 where sca_code='PD' and sca_pic is null;
count(*)
1
select count(*) from t1 where cat_code='E';
count(*)
0
alter table t1 drop index sca_pic, add index (sca_pic, cat_code);
select count(*) from t1 where sca_code='PD' and sca_pic is null;
count(*)
1
select count(*) from t1 where sca_pic >= 'n';
count(*)
1
select sca_pic from t1 where sca_pic is null;
sca_pic
NULL
NULL
update t1 set sca_pic="test" where sca_pic is null;
delete from t1 where sca_code='pd';
drop table t1;
set @a:=now();
CREATE TABLE t1 (a int not null, b timestamp not null, primary key (a)) engine=bdb;
insert into t1 (a) values(1),(2),(3);
select t1.a from t1 natural join t1 as t2 where t1.b >= @a order by t1.a;
a
1
2
3
select a from t1 natural join t1 as t2 where b >= @a order by a;
a
1
2
3
update t1 set a=5 where a=1;
select a from t1;
a
2
3
5
drop table t1;
flush logs;
create table t1 (b blob, i int, key (b(100)), key (i), key (i, b(20))) engine=bdb;
insert into t1 values ('this is a blob', 1), (null, -1), (null, null),("",1),("",2),("",3);
select b from t1 where b = 'this is a blob';
b
this is a blob
select * from t1 where b like 't%';
b i
this is a blob 1
select b, i from t1 where b is not null;
b i
this is a blob 1
1
2
3
select * from t1 where b is null and i > 0;
b i
select * from t1 where i is NULL;
b i
NULL NULL
update t1 set b='updated' where i=1;
select * from t1;
b i
updated 1
NULL -1
NULL NULL
updated 1
2
3
drop table t1;
create table t1 (a varchar(100) not null, primary key(a), b int not null) engine=bdb;
insert into t1 values("hello",1),("world",2);
select * from t1 order by b desc;
a b
world 2
hello 1
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 PRIMARY 1 a A 2 NULL NULL BTREE
drop table t1;
create table t1 (i int, j int )ENGINE=BDB;
insert into t1 values (1,2);
select * from t1 where i=1 and j=2;
i j
1 2
create index ax1 on t1 (i,j);
select * from t1 where i=1 and j=2;
i j
1 2
drop table t1;
create table t1
(
branch_id int auto_increment primary key,
branch_name varchar(255) not null,
branch_active int not null default 1,
unique branch_name(branch_name),
index branch_active(branch_active)
) engine=bdb;
create table t2
(
target_id int auto_increment primary key,
target_name varchar(255) not null,
target_active int not null default 1,
unique target_name(target_name),
index target_active(target_active)
) engine=bdb;
create table t3
(
platform_id int auto_increment primary key,
platform_name varchar(255) not null,
platform_active int not null default 1,
unique platform_name(platform_name),
index platform_active(platform_active)
) engine=bdb;
create table t4
(
product_id int auto_increment primary key,
product_name varchar(255) not null,
version_file varchar(255) not null,
product_active int not null default 1,
unique product_name(product_name),
index product_active(product_active)
) engine=bdb;
create table t5
(
product_file_id int auto_increment primary key,
product_id int not null,
file_name varchar(255) not null,
/* cvs module used to find the file version */
module_name varchar(255) not null,
/* flag whether the file is still included in the product */
file_included int not null default 1,
unique product_file(product_id,file_name),
index file_included(file_included)
) engine=bdb;
create table t6
(
file_platform_id int auto_increment primary key,
product_file_id int not null,
platform_id int not null,
branch_id int not null,
/* filename in the build system */
build_filename varchar(255) not null,
/* default filename in the build archive */
archive_filename varchar(255) not null,
unique file_platform(product_file_id,platform_id,branch_id)
) engine=bdb;
create table t8
(
archive_id int auto_increment primary key,
branch_id int not null,
target_id int not null,
platform_id int not null,
product_id int not null,
status_id int not null default 1,
unique archive(branch_id,target_id,platform_id,product_id),
index status_id(status_id)
) engine=bdb;
create table t7
(
build_id int auto_increment primary key,
branch_id int not null,
target_id int not null,
build_number int not null,
build_date date not null,
/* build system tag, e.g. 'rmanight-022301-1779' */
build_tag varchar(255) not null,
/* path relative to the build archive root, e.g. 'current' */
build_path text not null,
unique build(branch_id,target_id,build_number)
) engine=bdb;
insert into t1 (branch_name)
values ('RealMedia');
insert into t1 (branch_name)
values ('RP8REV');
insert into t1 (branch_name)
values ('SERVER_8_0_GOLD');
insert into t2 (target_name)
values ('rmanight');
insert into t2 (target_name)
values ('playerall');
insert into t2 (target_name)
values ('servproxyall');
insert into t3 (platform_name)
values ('linux-2.0-libc6-i386');
insert into t3 (platform_name)
values ('win32-i386');
insert into t4 (product_name, version_file)
values ('realserver', 'servinst');
insert into t4 (product_name, version_file)
values ('realproxy', 'prxyinst');
insert into t4 (product_name, version_file)
values ('realplayer', 'playinst');
insert into t4 (product_name, version_file)
values ('plusplayer', 'plusinst');
create temporary table tmp1
select branch_id, target_id, platform_id, product_id
from t1, t2, t3, t4 ;
create temporary table tmp2
select tmp1.branch_id, tmp1.target_id, tmp1.platform_id, tmp1.product_id
from tmp1 left join t8
using (branch_id,target_id,platform_id,product_id)
where t8.archive_id is null ;
insert into t8
(branch_id, target_id, platform_id, product_id, status_id)
select branch_id, target_id, platform_id, product_id, 1
from tmp2 ;
drop table tmp1 ;
drop table tmp2 ;
insert into t5 (product_id, file_name, module_name)
values (1, 'servinst', 'server');
insert into t5 (product_id, file_name, module_name)
values (2, 'prxyinst', 'server');
insert into t5 (product_id, file_name, module_name)
values (3, 'playinst', 'rpapp');
insert into t5 (product_id, file_name, module_name)
values (4, 'plusinst', 'rpapp');
insert into t6
(product_file_id,platform_id,branch_id,build_filename,archive_filename)
values (1, 2, 3, 'servinst.exe', 'win32-servinst.exe');
insert into t6
(product_file_id,platform_id,branch_id,build_filename,archive_filename)
values (1, 1, 3, 'v80_linux-2.0-libc6-i386_servinst.bin', 'linux2-servinst.exe');
insert into t6
(product_file_id,platform_id,branch_id,build_filename,archive_filename)
values (3, 2, 2, 'playinst.exe', 'win32-playinst.exe');
insert into t6
(product_file_id,platform_id,branch_id,build_filename,archive_filename)
values (4, 2, 2, 'playinst.exe', 'win32-playinst.exe');
insert into t7
(branch_id,target_id,build_number,build_tag,build_date,build_path)
values (2, 2, 1071, 'playerall-022101-1071', '2001-02-21', 'current');
insert into t7
(branch_id,target_id,build_number,build_tag,build_date,build_path)
values (2, 2, 1072, 'playerall-022201-1072', '2001-02-22', 'current');
insert into t7
(branch_id,target_id,build_number,build_tag,build_date,build_path)
values (3, 3, 388, 'servproxyall-022201-388', '2001-02-22', 'current');
insert into t7
(branch_id,target_id,build_number,build_tag,build_date,build_path)
values (3, 3, 389, 'servproxyall-022301-389', '2001-02-23', 'current');
insert into t7
(branch_id,target_id,build_number,build_tag,build_date,build_path)
values (4, 4, 100, 'foo target-010101-100', '2001-01-01', 'current');
update t8
set status_id=2
where branch_id=2 and target_id=2 and platform_id=2 and product_id=1;
select t7.build_path
from
t1,
t7,
t2,
t3,
t4,
t5,
t6
where
t7.branch_id = t1.branch_id and
t7.target_id = t2.target_id and
t5.product_id = t4.product_id and
t6.product_file_id = t5.product_file_id and
t6.platform_id = t3.platform_id and
t6.branch_id = t6.branch_id and
t7.build_id = 1 and
t4.product_id = 3 and
t5.file_name = 'playinst' and
t3.platform_id = 2;
build_path
current
drop table t1, t2, t3, t4, t5, t6, t7, t8;
CREATE TABLE t1 (
a tinytext NOT NULL,
b tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY (a(32),b)
) ENGINE=BDB;
INSERT INTO t1 VALUES ('a',1),('a',2);
SELECT * FROM t1 WHERE a='a' AND b=2;
a b
a 2
SELECT * FROM t1 WHERE a='a' AND b in (2);
a b
a 2
SELECT * FROM t1 WHERE a='a' AND b in (1,2);
a b
a 1
a 2
drop table t1;
CREATE TABLE t1 (
a int3 unsigned NOT NULL,
b int1 unsigned NOT NULL,
UNIQUE (a, b)
) ENGINE = BDB;
INSERT INTO t1 VALUES (1, 1);
SELECT MIN(B),MAX(b) FROM t1 WHERE t1.a = 1;
MIN(B) MAX(b)
1 1
drop table t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=bdb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
insert into t1 values (99,1,2,'D'),(1,1,2,'D');
ERROR 23000: Duplicate entry '1-1' for key 1
select id from t1;
id
0
1
2
select id from t1;
id
0
1
2
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=bdb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
begin;
insert into t1 values (99,1,2,'D'),(1,1,2,'D');
ERROR 23000: Duplicate entry '1-1' for key 1
select id from t1;
id
0
1
2
insert ignore into t1 values (100,1,2,'D'),(1,1,99,'D');
commit;
select id,id3 from t1;
id id3
0 0
1 1
2 2
100 2
UNLOCK TABLES;
DROP TABLE t1;
CREATE TABLE t1 (SYAIN_NO char(5) NOT NULL default '', KINMU_DATE char(6) NOT NULL default '', PRIMARY KEY (SYAIN_NO,KINMU_DATE)) ENGINE=BerkeleyDB;
CREATE TABLE t2 ( SYAIN_NO char(5) NOT NULL default '',STR_DATE char(8) NOT NULL default '',PRIMARY KEY (SYAIN_NO,STR_DATE) ) ENGINE=BerkeleyDB;
select T1.KINMU_DATE from t1 T1 ,t2 T2 where T1.SYAIN_NO = '12345' and T1.KINMU_DATE = '200106' and T2.SYAIN_NO = T1.SYAIN_NO;
KINMU_DATE
select T1.KINMU_DATE from t1 T1 ,t2 T2 where T1.SYAIN_NO = '12345' and T1.KINMU_DATE = '200106' and T2.SYAIN_NO = T1.SYAIN_NO;
KINMU_DATE
DROP TABLE t1,t2;
create table t1 (a int(11) not null, b int(11) not null, unique (a,b)) engine=bdb;
insert into t1 values (1,1), (1,2);
select * from t1 where a = 1;
a b
1 1
1 2
select t1.*, t2.* from t1, t1 t2 where t1.a = t2.a and t2.a = 1;
a b a b
1 1 1 1
1 1 1 2
1 2 1 1
1 2 1 2
select * from t1 where a = 1;
a b
1 1
1 2
drop table t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=bdb;
insert into t1 values (0,0,0,'ABCDEFGHIJ');
create table t2 (id int NOT NULL,primary key (id)) engine=bdb;
LOCK TABLES t1 WRITE, t2 WRITE;
insert into t2 values(1);
SELECT t1.* FROM t1 WHERE id IN (1);
id id2 id3 dummy1
SELECT t1.* FROM t2 left outer join t1 on (t1.id=t2.id);
id id2 id3 dummy1
NULL NULL NULL NULL
delete from t1 where id3 >= 0 and id3 <= 0;
drop table t1,t2;
CREATE TABLE t1 (i varchar(48) NOT NULL default '', p varchar(255) default NULL,s varchar(48) NOT NULL default '', PRIMARY KEY (i), UNIQUE(p,s)) ENGINE=BDB;
INSERT INTO t1 VALUES ('00000000-e6c4ddeaa6-003b8-83458387','programs/xxxxxxxx.wmv','00000000-e6c4ddeb32-003bc-83458387');
SELECT * FROM t1 WHERE p='programs/xxxxxxxx.wmv';
i p s
00000000-e6c4ddeaa6-003b8-83458387 programs/xxxxxxxx.wmv 00000000-e6c4ddeb32-003bc-83458387
drop table t1;
CREATE TABLE t1 ( STR_DATE varchar(8) NOT NULL default '',INFO_NOTE varchar(200) default NULL,PRIMARY KEY (STR_DATE) ) ENGINE=BerkeleyDB;
select INFO_NOTE from t1 where STR_DATE = '20010610';
INFO_NOTE
select INFO_NOTE from t1 where STR_DATE < '20010610';
INFO_NOTE
select INFO_NOTE from t1 where STR_DATE > '20010610';
INFO_NOTE
drop table t1;
create table t1 (a int not null, b int, primary key (a)) engine =bdb;
create table t2 (a int not null, b int, primary key (a)) engine =bdb;
insert into t1 values (2, 3),(1, 7),(10, 7);
insert into t2 values (2, 3),(1, 7),(10, 7);
select * from t1;
a b
1 7
2 3
10 7
select * from t2;
a b
1 7
2 3
10 7
delete t1, t2 from t1, t2 where t1.a = t2.a;
select * from t1;
a b
select * from t2;
a b
select * from t2;
a b
drop table t1,t2;
create table t1 (x int not null, index(x)) engine=bdb;
insert into t1 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
select * from t1 where x <= 10 and x >= 7;
x
7
8
9
10
select * from t1 where x <= 10 and x >= 7 order by x;
x
7
8
9
10
select * from t1 where x <= 10 and x >= 7 order by x desc;
x
10
9
8
7
select * from t1 where x <= 8 and x >= 5 order by x desc;
x
8
7
6
5
select * from t1 where x < 8 and x > 5 order by x desc;
x
7
6
drop table t1;
create table t1 ( c char(8) not null ) engine=bdb;
insert into t1 values ('0'),('1'),('2'),('3'),('4'),('5'),('6'),('7'),('8'),('9');
insert into t1 values ('A'),('B'),('C'),('D'),('E'),('F');
alter table t1 add b char(8) not null;
alter table t1 add a char(8) not null;
alter table t1 add primary key (a,b,c);
update t1 set a=c, b=c;
create table t2 (c char(8) not null, b char(8) not null, a char(8) not null, primary key(a,b,c)) engine=bdb;
insert into t2 select * from t1;
delete t1,t2 from t2,t1 where t1.a<'B' and t2.b=t1.b;
drop table t1,t2;
create table t1 (a char(10), key(a), b int not null, key(b)) engine=bdb;
insert into t1 values ('a',1),('A',2);
explain select a from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
select a from t1;
a
a
A
explain select b from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 2 Using index
select b from t1;
b
1
2
alter table t1 modify a char(10) binary;
explain select a from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 11 NULL 2 Using index
select a from t1;
a
A
a
drop table t1;
create table t1(
pk1 text not null, pk2 text not null, pk3 char(4),
key1 int, key2 int,
primary key(pk1(4), pk2(4), pk3), key(key1), key(key2)
) engine=bdb;
insert into t1 values (concat('aaa-', repeat('A', 4000)),
concat('eee-', repeat('e', 4000)), 'a++a', 1, 1);
insert into t1 values (concat('bbb-', repeat('B', 4000)),
concat('ggg-', repeat('G', 4000)), 'b++b', 1, 1);
select substring(pk1, 1, 4), substring(pk1, 4001),
substring(pk2, 1, 4), substring(pk2, 4001), pk3, key1, key2
from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
substring(pk1, 1, 4) substring(pk1, 4001) substring(pk2, 1, 4) substring(pk2, 4001) pk3 key1 key2
aaa- AAAA eee- eeee a++a 1 1
bbb- BBBB ggg- GGGG b++b 1 1
drop table t1;
create table t1 (
pk1 varchar(8) not null default '',
pk2 varchar(4) not null default '',
key1 int(11) default null,
key2 int(11) default null,
primary key (pk1,pk2),
key key1 (key1),
key key2 (key2)) engine=bdb;
insert into t1 values ('','empt',2,2), ('a','a--a',2,2),
('bb','b--b',2,2), ('ccc','c--c',2,2), ('dddd','d--d',2,2);
select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
pk1 pk2 key1 key2
empt 2 2
a a--a 2 2
bb b--b 2 2
ccc c--c 2 2
dddd d--d 2 2
drop table t1;
set autocommit=0;
create table t1(b varchar(30)) engine=bdb;
insert into t1 values ('one');
commit;
select b FROM t1 outer_table where
exists (select 'two' from t1 where 'two' = outer_table.b);
b
drop table t1;
set autocommit=1;
create table t1(a int primary key, b varchar(30)) engine=bdb;
insert into t1 values (1,'one'), (2,'two'), (3,'three'), (4,'four');
create table t2 like t1;
insert t2 select * from t1;
select a from t1 where a in (select a from t2);
a
1
2
3
4
delete from t2;
insert into t2 (a, b)
select a, b from t1 where (a, b) in (select a, b from t1);
select * from t2;
a b
1 one
2 two
3 three
4 four
drop table t1, t2;
create table t1 (a int, b varchar(30), primary key(a)) engine = bdb;
insert into t1 values (1,'one');
commit;
truncate t1;
select * from t1;
a b
drop table t1;
SET NAMES utf8;
create table t1 (a varchar(255) character set utf8) engine=bdb;
set @a:= convert(repeat(_latin1 0xFF, 255) using utf8);
insert into t1 values (@a);
select a, length(a), char_length(a) from t1;
a length(a) char_length(a)
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ 510 255
drop table t1;
SET NAMES latin1;
CREATE TABLE t1 (
id int unsigned NOT NULL auto_increment,
list_id smallint unsigned NOT NULL,
term TEXT NOT NULL,
PRIMARY KEY(id),
INDEX(list_id, term(4))
) ENGINE=BDB CHARSET=utf8;
INSERT INTO t1 SET list_id = 1, term = "letterc";
INSERT INTO t1 SET list_id = 1, term = "letterb";
INSERT INTO t1 SET list_id = 1, term = "lettera";
INSERT INTO t1 SET list_id = 1, term = "letterd";
SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterc");
id
1
SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterb");
id
2
SELECT id FROM t1 WHERE (list_id = 1) AND (term = "lettera");
id
3
SELECT id FROM t1 WHERE (list_id = 1) AND (term = "letterd");
id
4
DROP TABLE t1;
create temporary table t1 (a int, primary key(a)) engine=bdb;
select * from t1;
a
alter table t1 add b int;
select * from t1;
a b
drop table t1;
set storage_engine=bdb;
drop table if exists t1,t2,t3;
--- Testing varchar ---
--- Testing varchar ---
create table t1 (v varchar(10), c char(10), t text);
insert into t1 values('+ ', '+ ', '+ ');
set @a=repeat(' ',20);
insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
Warnings:
Note 1265 Data truncated for column 'v' at row 1
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+ *+*+ *
*+ *+*+ *
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) default NULL,
`c` char(10) default NULL,
`t` text
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
create table t2 like t1;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`v` varchar(10) default NULL,
`c` char(10) default NULL,
`t` text
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
create table t3 select * from t1;
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
`v` varchar(10) default NULL,
`c` char(10) default NULL,
`t` text
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
alter table t1 modify c varchar(10);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) default NULL,
`c` varchar(10) default NULL,
`t` text
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
alter table t1 modify v char(10);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) default NULL,
`c` varchar(10) default NULL,
`t` text
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
alter table t1 modify t varchar(10);
Warnings:
Note 1265 Data truncated for column 't' at row 2
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) default NULL,
`c` varchar(10) default NULL,
`t` varchar(10) default NULL
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+*+*+ *
*+*+*+ *
drop table t1,t2,t3;
create table t1 (v varchar(10), c char(10), t text, key(v), key(c), key(t(10)));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) default NULL,
`c` char(10) default NULL,
`t` text,
KEY `v` (`v`),
KEY `c` (`c`),
KEY `t` (`t`(10))
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
select count(*) from t1;
count(*)
270
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where c='a';
count(*)
10
select count(*) from t1 where t='a';
count(*)
10
select count(*) from t1 where v='a ';
count(*)
10
select count(*) from t1 where c='a ';
count(*)
10
select count(*) from t1 where t='a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where c like 'a%';
count(*)
11
select count(*) from t1 where t like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 13 const # Using where
explain select count(*) from t1 where c='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref c c 11 const # Using where
explain select count(*) from t1 where t='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range t t 13 NULL # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 13 const # Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 13 const # Using where
alter table t1 add unique(v);
ERROR 23000: Duplicate entry '{ ' for key 1
alter table t1 add key(v);
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
qq
*a*a*a*
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v,v_2 # 13 const # Using where
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(c) from t1 group by v limit 10;
v count(c)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(c) from t1 group by v limit 10;
v count(c)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select c,count(*) from t1 group by c limit 10;
c count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select c,count(t) from t1 group by c limit 10;
c count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result c,count(t) from t1 group by c limit 10;
c count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select t,count(*) from t1 group by t limit 10;
t count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select t,count(t) from t1 group by t limit 10;
t count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result t,count(t) from t1 group by t limit 10;
t count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 modify v varchar(300), drop key v, drop key v_2, add key v (v);
Warnings:
Warning 1071 Specified key was too long; max key length is 255 bytes
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(300) default NULL,
`c` char(10) default NULL,
`t` text,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`(255))
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where v='a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 258 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 258 NULL # Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 258 const # Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 258 const # Using where
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 258 const # Using where
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 drop key v, add key v (v(30));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(300) default NULL,
`c` char(10) default NULL,
`t` text,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`(30))
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where v='a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 33 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 33 NULL # Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 33 const # Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 33 const # Using where
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref v v 33 const # Using where
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 modify v varchar(600), drop key v, add key v (v);
Warnings:
Warning 1071 Specified key was too long; max key length is 255 bytes
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(600) default NULL,
`c` char(10) default NULL,
`t` text,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`(255))
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
drop table t1;
create table t1 (a char(10), unique (a));
insert into t1 values ('a ');
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a' for key 1
alter table t1 modify a varchar(10);
insert into t1 values ('a '),('a '),('a '),('a ');
ERROR 23000: Duplicate entry 'a ' for key 1
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a ' for key 1
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a ' for key 1
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a ' for key 1
update t1 set a='a ' where a like 'a%';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='abc ' where a like 'a ';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='a ' where a like 'a %';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='a ' where a like 'a ';
select concat(a,'.') from t1;
concat(a,'.')
a .
drop table t1;
create table t1 (v varchar(10), c char(10), t text, key(v(5)), key(c(5)), key(t(5)));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) default NULL,
`c` char(10) default NULL,
`t` text,
KEY `v` (`v`(5)),
KEY `c` (`c`(5)),
KEY `t` (`t`(5))
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v char(10) character set utf8);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) character set utf8 default NULL
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v varchar(10), c char(10)) row_format=fixed;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) default NULL,
`c` char(10) default NULL
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1 ROW_FORMAT=FIXED
insert into t1 values('a','a'),('a ','a ');
select concat('*',v,'*',c,'*') from t1;
concat('*',v,'*',c,'*')
*a*a*
*a *a*
drop table t1;
create table t1 (v varchar(65530), key(v(10)));
insert into t1 values(repeat('a',65530));
select length(v) from t1 where v=repeat('a',65530);
length(v)
65530
drop table t1;
create table t1(a int, b varchar(12), key ba(b, a));
insert into t1 values (1, 'A'), (20, NULL);
explain select * from t1 where a=20 and b is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref ba ba 20 const,const 1 Using where
select * from t1 where a=20 and b is null;
a b
20 NULL
drop table t1;
create table t1 (v varchar(65530), key(v));
Warnings:
Warning 1071 Specified key was too long; max key length is 255 bytes
drop table if exists t1;
create table t1 (v varchar(65536));
Warnings:
Note 1246 Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` mediumtext
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v varchar(65530) character set utf8);
Warnings:
Note 1246 Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` mediumtext character set utf8
) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
drop table t1;
set storage_engine=MyISAM;
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