mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 04:53:01 +01:00
e72124c4cc
New multi-key-cache handling. This was needed becasue the old one didn't work reliable with MERGE tables.
ALTER TABLE table_name ... CHARACTER SET ... now changes all char/varchar/text columns to the given character set
(One must use ALTER TABLE ... DEFAULT CHARACTER SET ... to change the default character set)
Fixed that have_compress is detected properly (fixes problems with func_compress.test on platforms without zlib)
New syntax for CACHE INDEX ('keys' is optional if no index name is given and one mentions the key cache name only ones)
Removed compiler warnings
Added mysql_set_server_option() to allow clients like PHP to easaily set/reset the multi-statement flag.
BUILD/compile-pentium-valgrind-max:
Add test of isam
client/mysql.cc:
CLIENT_MULTI_QUERIES -> CLIENT_MULTI_STATEMENTS
include/my_base.h:
Remove HA_EXTRA_SET_KEY_CACHE
include/my_no_pthread.h:
Add defines to ignore rw-locks when running without threads
include/my_sys.h:
Added function for multi-key-caches
include/myisam.h:
Added function to handle multi-key-caches
include/mysql.h:
Added mysql_set_server_option
include/mysql_com.h:
CLIENT_MULTI_QUERIES -> CLIENT_MULTI_STATEMENTS
Added enum_mysql_set_option
include/mysqld_error.h:
Added error message for unknown key cache
innobase/srv/srv0start.c:
Removed warning that is confused for MySQL users
libmysql/libmysql.c:
Added mysql_set_server_option()
libmysql/libmysql.def:
Added mysql_set_server_option()
myisam/ft_nlq_search.c:
Removed compiler warning
myisam/ft_static.c:
Removed compiler warning and fixed wrong return value
myisam/mi_check.c:
Clean up multi-key-cache usage
myisam/mi_checksum.c:
Removed not used variable
myisam/mi_close.c:
keycache -> key_cache
myisam/mi_delete_all.c:
keycache -> key_cache
myisam/mi_extra.c:
keycache -> key_cache
Removed HA_EXTRA_SET_KEY_CACHE
myisam/mi_keycache.c:
Changed logic so that it's MyISAM that is responsible for assign tables to different key caches instead of the upper level
myisam/mi_locking.c:
Don't change key cache on unlock (must be done before)
myisam/mi_open.c:
Fetch key cache to use from multi_key_cache_search()
myisam/mi_page.c:
keycache -> key_cache
myisam/mi_panic.c:
keycache -> key_cache
myisam/mi_preload.c:
keycache -> key_cache
myisam/mi_test1.c:
Use KEY_CACHE_BLOCK_SIZE
myisam/mi_test2.c:
Always test resize_key_cache()
myisam/mi_test3.c:
Use KEY_CACHE_BLOCK_SIZE instead of 512
myisam/myisamchk.c:
update for multiple key caches
myisam/myisamdef.h:
Remove reg_keycache
Add unique_name_length for storing length of unique_file_name
myisam/myisamlog.c:
Change how end_key_cache() is called
mysql-test/mysql-test-run.sh:
Fixed web link
Added name of failed test to abort row.
mysql-test/r/alter_table.result:
Testing of ALTER TABLE ... [DEFAULT] CHARACTER SET
mysql-test/r/case.result:
Update result for DEFAULT CHARSET...
mysql-test/r/cast.result:
Update result for DEFAULT CHARSET...
mysql-test/r/create.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_collate.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_latin1_de.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_many.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_mb.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_recoding.result:
Update result for DEFAULT CHARSET...
mysql-test/r/ctype_ucs.result:
Update result for DEFAULT CHARSET...
mysql-test/r/derived.result:
Use STRAIGHT_JOIN to make join order predictable
mysql-test/r/fulltext.result:
Update result for DEFAULT CHARSET...
mysql-test/r/func_str.result:
Update result for DEFAULT CHARSET...
mysql-test/r/func_system.result:
Update result for DEFAULT CHARSET...
mysql-test/r/gis-rtree.result:
Update result for DEFAULT CHARSET...
mysql-test/r/innodb.result:
Update result for DEFAULT CHARSET...
mysql-test/r/key_cache.result:
Update test for new key cache syntax.
Added more tests
mysql-test/r/merge.result:
Update result for DEFAULT CHARSET...
mysql-test/r/preload.result:
New syntax
mysql-test/r/show_check.result:
Update result for DEFAULT CHARSET...
mysql-test/r/sql_mode.result:
Update result for DEFAULT CHARSET...
mysql-test/r/subselect.result:
Update result for DEFAULT CHARSET...
mysql-test/r/type_blob.result:
Update result for DEFAULT CHARSET...
mysql-test/r/type_enum.result:
Update result for DEFAULT CHARSET...
mysql-test/r/type_nchar.result:
Update result for DEFAULT CHARSET...
mysql-test/r/type_set.result:
Update result for DEFAULT CHARSET...
mysql-test/r/union.result:
Use STRAIGHT_JOIN to make join order predictable
mysql-test/t/alter_table.test:
Testing of ALTER TABLE ... [DEFAULT] CHARACTER SET
mysql-test/t/ctype_many.test:
Update result for DEFAULT CHARSET...
mysql-test/t/derived.test:
Use STRAIGHT_JOIN to make join order predictable
mysql-test/t/isam.test:
Use disable warnings for test loop
mysql-test/t/join.test:
Update test now when we only support 61 tables in join
mysql-test/t/key_cache.test:
Update test for new key cache syntax.
Added more tests
mysql-test/t/preload.test:
Update for new syntax
mysql-test/t/union.test:
Use STRAIGHT_JOIN to make join order predictable
mysys/Makefile.am:
Added mf_keycaches.c
mysys/hash.c:
TRUE -> 1
mysys/mf_keycache.c:
Removed compiler warnings
Striped end space
Fixed indentation and improved function comments
TRUE -> 1
Changed parameters to end_key_cache() to make it easer to use
Fixed bug when using key blocks size > 1024 bytes (First part of index file could be overwritten with wrong data)
Split function flush_key_blocks into two functions to not get mutex used twice when called from flush_all_key_blocks()
mysys/my_bitmap.c:
More debugging
Safe bitmap_free()
Fixed indentation
mysys/my_getopt.c:
Ensure that we initialize option->value, option->max_value and value from GET_ASK_ADDR
mysys/my_thr_init.c:
Remove not used mutex THR_LOCK_keycache
mysys/typelib.c:
Fixed function comments
sql-common/client.c:
CLIENT_MULTI_QUERIES -> CLIENT_MULTI_STATEMENTS
Fixed the multi_result flag is set also on SELECT;s
sql/ha_myisam.cc:
Fixed multiple key_cache handling
(Now done on MyISAM level)
sql/ha_myisammrg.cc:
Fixed multiple key_cache handling
(Now done on MyISAM level)
sql/handler.cc:
New multi key cache handling
sql/handler.h:
New multi key cache handling
Added support for default character set
sql/item.h:
Added function cleanup() (Needed for prepared statements / cursors)
sql/item_cmpfunc.h:
Added cleanup function
sql/item_func.cc:
Indentation cleanup
sql/mysql_priv.h:
New multi-key-cache functions
Removed LOCK_assign
sql/mysqld.cc:
New multi-key-cache handling
Fixed that variable have_compress is set correctly
sql/protocol.cc:
SELECT didn't work reliable in multi-statements
sql/set_var.cc:
Support for new key cache variables
sql/set_var.h:
Support for new key cache variables
sql/share/czech/errmsg.txt:
New error messages
sql/share/danish/errmsg.txt:
New error messages
sql/share/dutch/errmsg.txt:
New error messages
sql/share/english/errmsg.txt:
New error messages
sql/share/estonian/errmsg.txt:
New error messages
sql/share/french/errmsg.txt:
New error messages
sql/share/german/errmsg.txt:
New error messages
sql/share/greek/errmsg.txt:
New error messages
sql/share/hungarian/errmsg.txt:
New error messages
sql/share/italian/errmsg.txt:
New error messages
sql/share/japanese/errmsg.txt:
New error messages
sql/share/korean/errmsg.txt:
New error messages
sql/share/norwegian-ny/errmsg.txt:
New error messages
sql/share/norwegian/errmsg.txt:
New error messages
sql/share/polish/errmsg.txt:
New error messages
sql/share/portuguese/errmsg.txt:
New error messages
sql/share/romanian/errmsg.txt:
New error messages
sql/share/russian/errmsg.txt:
New error messages
sql/share/serbian/errmsg.txt:
New error messages
sql/share/slovak/errmsg.txt:
New error messages
sql/share/spanish/errmsg.txt:
New error messages
sql/share/swedish/errmsg.txt:
New error messages
sql/share/ukrainian/errmsg.txt:
New error messages
sql/sql_base.cc:
Removed all key_cache handling (this is now done on MyISAM level)
Change table_charset -> default_table_charset
sql/sql_db.cc:
table_charset -> default_table_charset
sql/sql_delete.cc:
table_charset -> default_table_charset
sql/sql_lex.cc:
CLIENT_MULTI_QUERIES -> CLIENT_MULTI_STATEMENTS
sql/sql_lex.h:
New option to store a name and length
sql/sql_parse.cc:
Support for mysql_set_server_option()
Reset "default" keycache status variables in 'FLUSH STATUS' (Need to be improved later)
sql/sql_show.cc:
Add DEFAULT before CHARSET (for table character sets)
Fetch key cache variables from 'sql_key_cache'
sql/sql_table.cc:
table_charset -> default_table_charset
New multi-key-cache handling
sql/sql_test.cc:
Write information from all key caches
sql/sql_yacc.yy:
Changed syntax for CACHE INDEX ...
Force user to use DEFAULT before database/table level character sets
sql/structs.h:
Added SHOW_KEY_CACHE_LONG (to get values from sql_key_cache)
sql/table.cc:
table_charset -> default_table_charset
sql/table.h:
New key cache handling (this is now done in mysys/mf_keycaches.c)
sql/unireg.h:
A
525 lines
16 KiB
Text
525 lines
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Text
drop table if exists t1,t2,t3,t4,t5,t6;
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CREATE TABLE t1 (a int not null, b char (10) not null);
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insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
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CREATE TABLE t2 (a int not null, b char (10) not null);
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insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
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select a,b from t1 union select a,b from t2;
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a b
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1 a
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2 b
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3 c
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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2;
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2 order by b;
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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6 e
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5 f
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select a,b from t1 union all select a,b from t2 union select 7,'g';
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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7 g
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select 0,'#' union select a,b from t1 union all select a,b from t2 union select 7,'gg';
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0 #
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0 #
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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7 g
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select a,b from t1 union select a,b from t1;
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a b
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1 a
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2 b
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3 c
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select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b;
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t1 b count(*)
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t1 a 1
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t1 b 1
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t1 c 2
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t2 c 1
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t2 d 1
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t2 e 1
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t2 f 1
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 4;
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a b
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1 a
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2 b
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3 c
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4 d
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
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a b
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1 a
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2 b
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3 c
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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a b
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3 c
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2 b
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1 a
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by t1.b;
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ERROR 42000: Table 't1' from one of SELECT's can not be used in global ORDER clause
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explain extended (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4
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2 UNION t2 ALL NULL NULL NULL NULL 4 Using filesort
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Warnings:
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Note 1003 (select high_priority test.t1.a AS `a`,test.t1.b AS `b` from test.t1 limit 2) union all (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 order by test.t2.a limit 1) order by b desc
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(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
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a b
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1 a
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2 b
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select found_rows();
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found_rows()
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6
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select sql_calc_found_rows a,b from t1 union all select a,b from t2 limit 2;
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a b
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1 a
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2 b
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select found_rows();
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found_rows()
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8
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explain select a,b from t1 union all select a,b from t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4
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2 UNION t2 ALL NULL NULL NULL NULL 4
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explain select xx from t1 union select 1;
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ERROR 42S22: Unknown column 'xx' in 'field list'
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explain select a,b from t1 union select 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4
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2 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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explain select 1 union select a,b from t1 union select 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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2 UNION t1 ALL NULL NULL NULL NULL 4
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3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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explain select a,b from t1 union select 1 limit 0;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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2 UNION NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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select a,b from t1 into outfile 'skr' union select a,b from t2;
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ERROR HY000: Wrong usage of UNION and INTO
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select a,b from t1 order by a union select a,b from t2;
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ERROR HY000: Wrong usage of UNION and ORDER BY
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insert into t3 select a from t1 order by a union select a from t2;
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ERROR HY000: Wrong usage of UNION and ORDER BY
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create table t3 select a,b from t1 union select a from t2;
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ERROR 21000: The used SELECT statements have a different number of columns
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select a,b from t1 union select a from t2;
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ERROR 21000: The used SELECT statements have a different number of columns
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select * from t1 union select a from t2;
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ERROR 21000: The used SELECT statements have a different number of columns
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select a from t1 union select * from t2;
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ERROR 21000: The used SELECT statements have a different number of columns
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select * from t1 union select SQL_BUFFER_RESULT * from t2;
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ERROR 42000: Wrong usage/placement of 'SQL_BUFFER_RESULT'
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create table t3 select a,b from t1 union all select a,b from t2;
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insert into t3 select a,b from t1 union all select a,b from t2;
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replace into t3 select a,b as c from t1 union all select a,b from t2;
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drop table t1,t2,t3;
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select * union select 1;
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ERROR HY000: No tables used
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select 1 as a,(select a union select a);
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a (select a union select a)
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1 1
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(select 1) union (select 2) order by 0;
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ERROR 42S22: Unknown column '0' in 'order clause'
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SELECT @a:=1 UNION SELECT @a:=@a+1;
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@a:=1
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1
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2
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(SELECT 1) UNION (SELECT 2) ORDER BY (SELECT a);
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ERROR 42S22: Unknown column 'a' in 'field list'
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(SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);
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1 3
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1 3
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2 1
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CREATE TABLE t1 (
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`pseudo` char(35) NOT NULL default '',
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`pseudo1` char(35) NOT NULL default '',
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`same` tinyint(1) unsigned NOT NULL default '1',
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PRIMARY KEY (`pseudo1`),
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KEY `pseudo` (`pseudo`)
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) TYPE=MyISAM;
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INSERT INTO t1 (pseudo,pseudo1,same) VALUES ('joce', 'testtt', 1),('joce', 'tsestset', 1),('dekad', 'joce', 1);
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SELECT pseudo FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo FROM t1 WHERE pseudo='joce';
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pseudo
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dekad
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joce
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SELECT pseudo1 FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo1 FROM t1 WHERE pseudo='joce';
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pseudo1
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joce
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testtt
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tsestset
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SELECT * FROM t1 WHERE pseudo1='joce' UNION SELECT * FROM t1 WHERE pseudo='joce' order by pseudo desc,pseudo1 desc;
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pseudo pseudo1 same
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joce tsestset 1
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joce testtt 1
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dekad joce 1
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION ALL SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT 1;
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pseudo1
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testtt
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tsestset
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1
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drop table t1;
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create table t1 (a int);
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create table t2 (a int);
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insert into t1 values (1),(2),(3),(4),(5);
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insert into t2 values (11),(12),(13),(14),(15);
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(select * from t1 limit 2) union (select * from t2 limit 3) limit 4;
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a
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1
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2
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11
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12
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(select * from t1 limit 2) union (select * from t2 limit 3);
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a
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1
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2
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11
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12
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13
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(select * from t1 limit 2) union (select * from t2 limit 20,3);
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a
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1
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2
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set SQL_SELECT_LIMIT=2;
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(select * from t1 limit 1) union (select * from t2 limit 3);
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a
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1
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11
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set SQL_SELECT_LIMIT=DEFAULT;
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drop table t1,t2;
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CREATE TABLE t1 (
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cid smallint(5) unsigned NOT NULL default '0',
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cv varchar(250) NOT NULL default '',
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PRIMARY KEY (cid),
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UNIQUE KEY cv (cv)
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) ;
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INSERT INTO t1 VALUES (8,'dummy');
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CREATE TABLE t2 (
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cid bigint(20) unsigned NOT NULL auto_increment,
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cap varchar(255) NOT NULL default '',
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PRIMARY KEY (cid),
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KEY cap (cap)
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) ;
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CREATE TABLE t3 (
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gid bigint(20) unsigned NOT NULL auto_increment,
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gn varchar(255) NOT NULL default '',
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must tinyint(4) default NULL,
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PRIMARY KEY (gid),
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KEY gn (gn)
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) ;
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INSERT INTO t3 VALUES (1,'V1',NULL);
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CREATE TABLE t4 (
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uid bigint(20) unsigned NOT NULL default '0',
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gid bigint(20) unsigned default NULL,
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rid bigint(20) unsigned default NULL,
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cid bigint(20) unsigned default NULL,
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UNIQUE KEY m (uid,gid,rid,cid),
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KEY uid (uid),
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KEY rid (rid),
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KEY cid (cid),
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KEY container (gid,rid,cid)
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) ;
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INSERT INTO t4 VALUES (1,1,NULL,NULL);
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CREATE TABLE t5 (
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rid bigint(20) unsigned NOT NULL auto_increment,
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rl varchar(255) NOT NULL default '',
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PRIMARY KEY (rid),
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KEY rl (rl)
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) ;
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CREATE TABLE t6 (
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uid bigint(20) unsigned NOT NULL auto_increment,
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un varchar(250) NOT NULL default '',
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uc smallint(5) unsigned NOT NULL default '0',
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PRIMARY KEY (uid),
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UNIQUE KEY nc (un,uc),
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KEY un (un)
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) ;
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INSERT INTO t6 VALUES (1,'test',8);
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SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
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uid rl g1 cid gg
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1 NULL V1 NULL 1
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SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test";
|
|
uid rl g1 cid gg
|
|
(SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t3.must IS NOT NULL AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test") UNION (SELECT t4.uid, t5.rl, t3.gn as g1, t4.cid, t4.gid as gg FROM t3, t6, t1, t4 left join t5 on t5.rid = t4.rid left join t2 on t2.cid = t4.cid WHERE t3.gid=t4.gid AND t6.uid = t4.uid AND t6.uc = t1.cid AND t1.cv = "dummy" AND t6.un = "test");
|
|
uid rl g1 cid gg
|
|
1 NULL V1 NULL 1
|
|
drop table t1,t2,t3,t4,t5,t6;
|
|
CREATE TABLE t1 (a int not null, b char (10) not null);
|
|
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
|
|
CREATE TABLE t2 (a int not null, b char (10) not null);
|
|
insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
|
|
create table t3 select a,b from t1 union select a,b from t2;
|
|
create table t4 (select a,b from t1) union (select a,b from t2) limit 2;
|
|
insert into t4 select a,b from t1 union select a,b from t2;
|
|
insert into t3 (select a,b from t1) union (select a,b from t2) limit 2;
|
|
select * from t3;
|
|
a b
|
|
1 a
|
|
2 b
|
|
3 c
|
|
4 d
|
|
5 f
|
|
6 e
|
|
1 a
|
|
2 b
|
|
select * from t4;
|
|
a b
|
|
1 a
|
|
2 b
|
|
1 a
|
|
2 b
|
|
3 c
|
|
4 d
|
|
5 f
|
|
6 e
|
|
drop table t1,t2,t3,t4;
|
|
create table t1 (a int);
|
|
insert into t1 values (1),(2),(3);
|
|
create table t2 (a int);
|
|
insert into t2 values (3),(4),(5);
|
|
(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2) LIMIT 1;
|
|
a
|
|
1
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2) LIMIT 2;
|
|
a
|
|
1
|
|
3
|
|
select found_rows();
|
|
found_rows()
|
|
4
|
|
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION all (SELECT * FROM t2);
|
|
a
|
|
1
|
|
3
|
|
4
|
|
5
|
|
select found_rows();
|
|
found_rows()
|
|
4
|
|
(SELECT SQL_CALC_FOUND_ROWS * FROM t1) UNION all (SELECT * FROM t2 LIMIT 1);
|
|
a
|
|
1
|
|
2
|
|
3
|
|
3
|
|
select found_rows();
|
|
found_rows()
|
|
4
|
|
(SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1) UNION SELECT * FROM t2 LIMIT 1;
|
|
ERROR 42000: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION all SELECT * FROM t2 LIMIT 2;
|
|
a
|
|
1
|
|
3
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION all SELECT * FROM t2 LIMIT 2;
|
|
a
|
|
1
|
|
2
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2;
|
|
a
|
|
1
|
|
2
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 100;
|
|
a
|
|
1
|
|
2
|
|
3
|
|
4
|
|
5
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 100 UNION SELECT * FROM t2;
|
|
a
|
|
1
|
|
2
|
|
3
|
|
4
|
|
5
|
|
select found_rows();
|
|
found_rows()
|
|
5
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2;
|
|
a
|
|
1
|
|
3
|
|
4
|
|
5
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 1 UNION SELECT * FROM t2 LIMIT 2;
|
|
a
|
|
1
|
|
3
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 UNION SELECT * FROM t2 LIMIT 2,2;
|
|
a
|
|
3
|
|
4
|
|
select found_rows();
|
|
found_rows()
|
|
6
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 limit 2,2 UNION SELECT * FROM t2;
|
|
a
|
|
3
|
|
4
|
|
5
|
|
select found_rows();
|
|
found_rows()
|
|
5
|
|
SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a desc LIMIT 1;
|
|
a
|
|
5
|
|
(SELECT * FROM t1 ORDER by a) UNION ALL (SELECT * FROM t2 ORDER BY a) ORDER BY A desc LIMIT 4;
|
|
a
|
|
5
|
|
4
|
|
3
|
|
3
|
|
(SELECT * FROM t1) UNION all (SELECT SQL_CALC_FOUND_ROWS * FROM t2) LIMIT 1;
|
|
ERROR 42000: Wrong usage/placement of 'SQL_CALC_FOUND_ROWS'
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 ( id int(3) unsigned default '0') TYPE=MyISAM;
|
|
INSERT INTO t1 (id) VALUES("1");
|
|
CREATE TABLE t2 ( id int(3) unsigned default '0', id_master int(5) default '0', text1 varchar(5) default NULL, text2 varchar(5) default NULL) TYPE=MyISAM;
|
|
INSERT INTO t2 (id, id_master, text1, text2) VALUES("1", "1",
|
|
"foo1", "bar1");
|
|
INSERT INTO t2 (id, id_master, text1, text2) VALUES("2", "1",
|
|
"foo2", "bar2");
|
|
INSERT INTO t2 (id, id_master, text1, text2) VALUES("3", "1", NULL,
|
|
"bar3");
|
|
INSERT INTO t2 (id, id_master, text1, text2) VALUES("4", "1",
|
|
"foo4", "bar4");
|
|
SELECT 1 AS id_master, 1 AS id, NULL AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
|
|
id_master id text1 text2
|
|
1 1 NULL ABCDE
|
|
1 1 bar1
|
|
1 2 bar2
|
|
1 3 NULL bar3
|
|
1 4 bar4
|
|
SELECT 1 AS id_master, 1 AS id, 'ABCDE' AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
|
|
id_master id text1 text2
|
|
1 1 ABCDE ABCDE
|
|
1 1 foo1 bar1
|
|
1 2 foo2 bar2
|
|
1 3 NULL bar3
|
|
1 4 foo4 bar4
|
|
drop table if exists t1,t2;
|
|
create table t1 (a int not null primary key auto_increment, b int, key(b));
|
|
create table t2 (a int not null primary key auto_increment, b int);
|
|
insert into t1 (b) values (1),(2),(2),(3);
|
|
insert into t2 (b) values (10),(11),(12),(13);
|
|
explain extended (select * from t1 where a=1) union (select * from t2 where a=1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
|
|
2 UNION t2 const PRIMARY PRIMARY 4 const 1
|
|
Warnings:
|
|
Note 1003 (select high_priority test.t1.a AS `a`,test.t1.b AS `b` from test.t1 where (test.t1.a = 1)) union (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 where (test.t2.a = 1))
|
|
(select * from t1 where a=5) union (select * from t2 where a=1);
|
|
a b
|
|
1 10
|
|
(select * from t1 where a=5 and a=6) union (select * from t2 where a=1);
|
|
a b
|
|
1 10
|
|
(select t1.a,t1.b from t1,t2 where t1.a=5) union (select * from t2 where a=1);
|
|
a b
|
|
1 10
|
|
(select * from t1 where a=1) union (select t1.a,t2.a from t1,t2 where t1.a=t2.a);
|
|
a b
|
|
1 1
|
|
2 2
|
|
3 3
|
|
4 4
|
|
explain (select * from t1 where a=1 and b=10) union (select straight_join t1.a,t2.a from t1,t2 where t1.a=t2.a);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
2 UNION t1 index PRIMARY PRIMARY 4 NULL 4 Using index
|
|
2 UNION t2 index PRIMARY PRIMARY 4 NULL 3 Using where; Using index
|
|
explain (select * from t1 where a=1) union (select * from t1 where b=1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
|
|
2 UNION t1 ref b b 5 const 1 Using where
|
|
drop table t1,t2;
|
|
create table t1 ( id int not null auto_increment, primary key (id) ,user_name text );
|
|
create table t2 ( id int not null auto_increment, primary key (id) ,group_name text );
|
|
create table t3 ( id int not null auto_increment, primary key (id) ,user_id int ,index user_idx (user_id) ,foreign key (user_id) references users(id) ,group_id int ,index group_idx (group_id) ,foreign key (group_id) references groups(id) );
|
|
insert into t1 (user_name) values ('Tester');
|
|
insert into t2 (group_name) values ('Group A');
|
|
insert into t2 (group_name) values ('Group B');
|
|
insert into t3 (user_id, group_id) values (1,1);
|
|
select 1 'is_in_group', a.user_name, c.group_name, b.id from t1 a, t3 b, t2 c where a.id = b.user_id and b.group_id = c.id UNION select 0 'is_in_group', a.user_name, c.group_name, null from t1 a, t2 c;
|
|
is_in_group user_name group_name id
|
|
1 Tester Group A 1
|
|
0 Tester Group A NULL
|
|
0 Tester Group B NULL
|
|
drop table t1, t2, t3;
|
|
create table t1 (mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test MEDIUMINT UNSIGNED NULL);
|
|
create table t2 (mat_id MEDIUMINT UNSIGNED NOT NULL, pla_id MEDIUMINT UNSIGNED NOT NULL);
|
|
insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4), (NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8), (NULL, 'i', 9);
|
|
insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
|
|
SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id union SELECT 0, 0;
|
|
pla_id matintnum
|
|
100 a
|
|
101 a
|
|
102 a
|
|
103 b
|
|
104 b
|
|
105 c
|
|
0 0
|
|
drop table t1, t2;
|