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7517d7e112
"Process NATURAL and USING joins according to SQL:2003".
* Some of the main problems fixed by the patch:
- in "select *" queries the * expanded correctly according to
ANSI for arbitrary natural/using joins
- natural/using joins are correctly transformed into JOIN ... ON
for any number/nesting of the joins.
- column references are correctly resolved against natural joins
of any nesting and combined with arbitrary other joins.
* This patch also contains a fix for name resolution of items
inside the ON condition of JOIN ... ON - in this case items must
be resolved only against the JOIN operands. To support such
'local' name resolution, the patch introduces a stack of
name resolution contexts used at parse time.
NOTICE:
- This patch is not complete in the sense that
- there are 2 test cases that still do not pass -
one in join.test, one in select.test. Both are marked
with a comment "TODO: WL#2486".
- it does not include a new test specific for the task
mysql-test/include/ps_query.inc:
Adjusted according to standard NATURAL/USING join semantics.,
mysql-test/r/bdb.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/derived.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/errors.result:
The column as a whole cannot be resolved, so different error message.
mysql-test/r/fulltext.result:
Adjusted according to standard JOIN ... ON semantics =>
the ON condition can refer only to the join operands.
mysql-test/r/fulltext_order_by.result:
More detailed error message.
mysql-test/r/innodb.result:
Adjusted according to standard NATURAL/USING join semantics.
This test doesn't pass completetly yet!
mysql-test/r/insert_select.result:
More detailed error message.
mysql-test/r/join.result:
Adjusted according to standard NATURAL/USING join semantics.
NOTICE: there is one test case that still fails, and it is
commeted out and marked with WL#2486 in the test file.
mysql-test/r/join_crash.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/join_nested.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/join_outer.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/multi_update.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/null_key.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/order_by.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_2myisam.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_3innodb.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_4heap.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_5merge.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_6bdb.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/ps_7ndb.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/select.result:
Adjusted according to standard NATURAL/USING join semantics.
NOTICE: there is one failing test case which is commented with
WL#2486 in the test file.
mysql-test/r/subselect.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/type_ranges.result:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/r/union.result:
More detailed error message.
mysql-test/t/bdb.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/errors.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/fulltext.test:
Adjusted according to standard JOIN ... ON semantics =>
the ON condition can refer only to the join operands.
mysql-test/t/fulltext_order_by.test:
More detailed error message.
mysql-test/t/innodb.test:
Adjusted according to standard NATURAL/USING join semantics.
This test doesn't pass completetly yet!
mysql-test/t/insert_select.test:
More detailed error message.
mysql-test/t/join.test:
Adjusted according to standard NATURAL/USING join semantics.
NOTICE: there is one test case that still fails, and it is
commeted out and marked with WL#2486 in the test file.
mysql-test/t/join_crash.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/join_nested.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/join_outer.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/null_key.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/order_by.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/select.test:
Adjusted according to standard NATURAL/USING join semantics.
NOTICE: there is one test case that still fails, and it is
commeted out and marked with WL#2486 in the test file.
mysql-test/t/subselect.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/type_ranges.test:
Adjusted according to standard NATURAL/USING join semantics.
mysql-test/t/union.test:
More detailed error message.
sql/item.cc:
- extra parameter to find_field_in_tables
- find_field_in_real_table renamed to find_field_in_table
- fixed comments/typos
sql/item.h:
- added [first | last]_name_resolution_table to class
Name_resolution_context
- commented old code
- standardized formatting
sql/mysql_priv.h:
- refactored the find_field_in_XXX procedures,
- added a new procedure for natural join table references,
- renamed the find_field_in_XXX procedures to clearer names
sql/sp.cc:
- pass the top-most list of the FROM clause to setup_tables
- extra parameter to find_field_in_tables
sql/sql_acl.cc:
- renamed find_field_in_table => find_field_in_table_ref
- extra parameter to find_field_in_table_ref
- commented old code
sql/sql_base.cc:
This file contains the core of the implementation of the processing
of NATURAL/USING joins (WL#2486).
- added many comments to old code
- refactored the group of find_field_in_XXX procedures, and added a
new procedure for natural joins. There is one find_field_in_XXX procedure
per each type of table reference (stored table, merge view, or natural
join); one meta-procedure that selects the correct one depeneding on the
table reference; and one procedure that goes over a list of table
referenes.
- NATURAL/USING joins are processed through the procedures:
mark_common_columns, store_natural_using_join_columns,
store_top_level_join_columns, setup_natural_join_row_types.
The entry point to processing NATURAL/USING joins is the
procedure 'setup_natural_join_row_types'.
- Replaced the specialized Field_iterator_XXX iterators with one
generic iterator over the fields of a table reference.
- Simplified 'insert_fields' and 'setup_conds' due to encapsulation of
the processing of natural joins in a separate set of procedures.
sql/sql_class.h:
- Commented old code.
sql/sql_delete.cc:
- Pass the FROM clause to setup_tables.
sql/sql_help.cc:
- pass the end name resolution table to find_field_in_tables
- adjust the list of tables for name resolution
sql/sql_insert.cc:
- Changed the code that saves and restores the current context to
support the list of tables for name resolution -
context->first_name_resolution_table, and
table_list->next_name_resolution_table.
Needed to support an ugly trick to resolve inserted columns only in
the first table.
- Added Name_resolution_context::[first | last]_name_resolution_table.
- Commented old code
sql/sql_lex.cc:
- set select_lex.parent_lex correctly
- set correct state of the current name resolution context
sql/sql_lex.h:
- Added a stack of name resolution contexts to support local
contexts for JOIN ... ON conditions.
- Commented old code.
sql/sql_load.cc:
- Pass the FROM clause to setup_tables.
sql/sql_olap.cc:
- Pass the FROM clause to setup_tables.
sql/sql_parse.cc:
- correctly set SELECT_LEX::parent_lex
- set the first table of the current name resoltion context
- added support for NATURAL/USING joins
- commented old code
sql/sql_select.cc:
- Pass the FROM clause to setup_tables.
- Pass the end table to find_field_in_tables
- Improved comments
sql/sql_show.cc:
- Set SELECT_LEX::parent_lex.
sql/sql_update.cc:
- Pass the FROM clause to setup_tables.
sql/sql_yacc.yy:
- Added support for a stack of name resolution contexts needed to
implement name resolution for JOIN ... ON. A context is pushed
for each new JOIN ... ON, and popped afterwards.
- Added support for NATURAL/USING joins.
sql/table.cc:
- Added new class Natural_join_column to hide the heterogeneous
representation of column references for stored tables and for
views.
- Added a new list TABLE_LIST::next_name_resolution_table to
support name resolution with NATURAL/USING joins. Also added
other members to TABLE_LIST to support NATURAL/USING joins.
- Added a generic iterator over the fields of table references
of various types - class Field_iterator_table_ref
sql/table.h:
- Added new class Natural_join_column to hide the heterogeneous
representation of column references for stored tables and for
views.
- Added a new list TABLE_LIST::next_name_resolution_table to
support name resolution with NATURAL/USING joins. Also added
other members to TABLE_LIST to support NATURAL/USING joins.
- Added a generic iterator over the fields of table references
of various types - class Field_iterator_table_ref
tests/mysql_client_test.c:
Adjusted according to standard NATURAL JOIN syntax.
377 lines
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377 lines
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drop table if exists t1,t2,t3;
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CREATE TABLE t1 (S1 INT);
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CREATE TABLE t2 (S1 INT);
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INSERT INTO t1 VALUES (1);
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INSERT INTO t2 VALUES (2);
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SELECT * FROM t1 JOIN t2;
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S1 S1
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1 2
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SELECT * FROM t1 INNER JOIN t2;
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S1 S1
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1 2
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SELECT * from t1 JOIN t2 USING (S1);
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S1
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SELECT * FROM t1 INNER JOIN t2 USING (S1);
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S1
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SELECT * from t1 CROSS JOIN t2;
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S1 S1
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1 2
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SELECT * from t1 LEFT JOIN t2 USING(S1);
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S1
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1
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SELECT * from t1 LEFT JOIN t2 ON(t2.S1=2);
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S1 S1
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1 2
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SELECT * from t1 RIGHT JOIN t2 USING(S1);
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S1
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2
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SELECT * from t1 RIGHT JOIN t2 ON(t1.S1=1);
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S1 S1
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1 2
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drop table t1,t2;
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create table t1 (id int primary key);
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create table t2 (id int);
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insert into t1 values (75);
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insert into t1 values (79);
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insert into t1 values (78);
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insert into t1 values (77);
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replace into t1 values (76);
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replace into t1 values (76);
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insert into t1 values (104);
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insert into t1 values (103);
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insert into t1 values (102);
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insert into t1 values (101);
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insert into t1 values (105);
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insert into t1 values (106);
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insert into t1 values (107);
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insert into t2 values (107),(75),(1000);
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select t1.id, t2.id from t1, t2 where t2.id = t1.id;
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id id
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107 107
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75 75
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select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t1.id;
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id count(t2.id)
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75 1
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107 1
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select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t2.id;
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id count(t2.id)
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75 1
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107 1
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select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
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id id
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NULL 75
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explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const PRIMARY NULL NULL NULL 1 Impossible ON condition
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where
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explain select t1.id, t2.id from t1, t2 where t2.id = t1.id and t1.id <0 and t1.id > 0;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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drop table t1,t2;
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CREATE TABLE t1 (
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id int(11) NOT NULL auto_increment,
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token varchar(100) DEFAULT '' NOT NULL,
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count int(11) DEFAULT '0' NOT NULL,
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qty int(11),
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phone char(1) DEFAULT '' NOT NULL,
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timestamp datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
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PRIMARY KEY (id),
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KEY token (token(15)),
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KEY timestamp (timestamp),
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UNIQUE token_2 (token(75),count,phone)
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);
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INSERT INTO t1 VALUES (21,'e45703b64de71482360de8fec94c3ade',3,7800,'n','1999-12-23 17:22:21');
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INSERT INTO t1 VALUES (22,'e45703b64de71482360de8fec94c3ade',4,5000,'y','1999-12-23 17:22:21');
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INSERT INTO t1 VALUES (18,'346d1cb63c89285b2351f0ca4de40eda',3,13200,'b','1999-12-23 11:58:04');
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INSERT INTO t1 VALUES (17,'ca6ddeb689e1b48a04146b1b5b6f936a',4,15000,'b','1999-12-23 11:36:53');
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INSERT INTO t1 VALUES (16,'ca6ddeb689e1b48a04146b1b5b6f936a',3,13200,'b','1999-12-23 11:36:53');
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INSERT INTO t1 VALUES (26,'a71250b7ed780f6ef3185bfffe027983',5,1500,'b','1999-12-27 09:44:24');
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INSERT INTO t1 VALUES (24,'4d75906f3c37ecff478a1eb56637aa09',3,5400,'y','1999-12-23 17:29:12');
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INSERT INTO t1 VALUES (25,'4d75906f3c37ecff478a1eb56637aa09',4,6500,'y','1999-12-23 17:29:12');
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INSERT INTO t1 VALUES (27,'a71250b7ed780f6ef3185bfffe027983',3,6200,'b','1999-12-27 09:44:24');
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INSERT INTO t1 VALUES (28,'a71250b7ed780f6ef3185bfffe027983',3,5400,'y','1999-12-27 09:44:36');
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INSERT INTO t1 VALUES (29,'a71250b7ed780f6ef3185bfffe027983',4,17700,'b','1999-12-27 09:45:05');
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CREATE TABLE t2 (
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id int(11) NOT NULL auto_increment,
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category int(11) DEFAULT '0' NOT NULL,
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county int(11) DEFAULT '0' NOT NULL,
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state int(11) DEFAULT '0' NOT NULL,
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phones int(11) DEFAULT '0' NOT NULL,
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nophones int(11) DEFAULT '0' NOT NULL,
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PRIMARY KEY (id),
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KEY category (category,county,state)
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);
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INSERT INTO t2 VALUES (3,2,11,12,5400,7800);
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INSERT INTO t2 VALUES (4,2,25,12,6500,11200);
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INSERT INTO t2 VALUES (5,1,37,6,10000,12000);
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select a.id, b.category as catid, b.state as stateid, b.county as countyid from t1 a, t2 b ignore index (primary) where (a.token ='a71250b7ed780f6ef3185bfffe027983') and (a.count = b.id);
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id catid stateid countyid
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27 2 12 11
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28 2 12 11
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29 2 12 25
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26 1 6 37
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select a.id, b.category as catid, b.state as stateid, b.county as
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countyid from t1 a, t2 b where (a.token =
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'a71250b7ed780f6ef3185bfffe027983') and (a.count = b.id) order by a.id;
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id catid stateid countyid
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26 1 6 37
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27 2 12 11
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28 2 12 11
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29 2 12 25
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drop table t1, t2;
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create table t1 (a int primary key);
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insert into t1 values(1),(2);
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select a from t1 as t1 left join t1 as t2 using (a) left join t1 as t3 using (a) left join t1 as t4 using (a) left join t1 as t5 using (a) left join t1 as t6 using (a) left join t1 as t7 using (a) left join t1 as t8 using (a) left join t1 as t9 using (a) left join t1 as t10 using (a) left join t1 as t11 using (a) left join t1 as t12 using (a) left join t1 as t13 using (a) left join t1 as t14 using (a) left join t1 as t15 using (a) left join t1 as t16 using (a) left join t1 as t17 using (a) left join t1 as t18 using (a) left join t1 as t19 using (a) left join t1 as t20 using (a) left join t1 as t21 using (a) left join t1 as t22 using (a) left join t1 as t23 using (a) left join t1 as t24 using (a) left join t1 as t25 using (a) left join t1 as t26 using (a) left join t1 as t27 using (a) left join t1 as t28 using (a) left join t1 as t29 using (a) left join t1 as t30 using (a) left join t1 as t31 using (a);
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a
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1
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2
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select a from t1 as t1 left join t1 as t2 using (a) left join t1 as t3 using (a) left join t1 as t4 using (a) left join t1 as t5 using (a) left join t1 as t6 using (a) left join t1 as t7 using (a) left join t1 as t8 using (a) left join t1 as t9 using (a) left join t1 as t10 using (a) left join t1 as t11 using (a) left join t1 as t12 using (a) left join t1 as t13 using (a) left join t1 as t14 using (a) left join t1 as t15 using (a) left join t1 as t16 using (a) left join t1 as t17 using (a) left join t1 as t18 using (a) left join t1 as t19 using (a) left join t1 as t20 using (a) left join t1 as t21 using (a) left join t1 as t22 using (a) left join t1 as t23 using (a) left join t1 as t24 using (a) left join t1 as t25 using (a) left join t1 as t26 using (a) left join t1 as t27 using (a) left join t1 as t28 using (a) left join t1 as t29 using (a) left join t1 as t30 using (a) left join t1 as t31 using (a) left join t1 as t32 using (a) left join t1 as t33 using (a) left join t1 as t34 using (a) left join t1 as t35 using (a) left join t1 as t36 using (a) left join t1 as t37 using (a) left join t1 as t38 using (a) left join t1 as t39 using (a) left join t1 as t40 using (a) left join t1 as t41 using (a) left join t1 as t42 using (a) left join t1 as t43 using (a) left join t1 as t44 using (a) left join t1 as t45 using (a) left join t1 as t46 using (a) left join t1 as t47 using (a) left join t1 as t48 using (a) left join t1 as t49 using (a) left join t1 as t50 using (a) left join t1 as t51 using (a) left join t1 as t52 using (a) left join t1 as t53 using (a) left join t1 as t54 using (a) left join t1 as t55 using (a) left join t1 as t56 using (a) left join t1 as t57 using (a) left join t1 as t58 using (a) left join t1 as t59 using (a) left join t1 as t60 using (a) left join t1 as t61 using (a) left join t1 as t62 using (a) left join t1 as t63 using (a) left join t1 as t64 using (a) left join t1 as t65 using (a);
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ERROR HY000: Too many tables; MySQL can only use XX tables in a join
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drop table t1;
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CREATE TABLE t1 (
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a int(11) NOT NULL,
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b int(11) NOT NULL,
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PRIMARY KEY (a,b)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(2,3);
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CREATE TABLE t2 (
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a int(11) default NULL
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) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (2),(3);
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SELECT t1.a,t2.a,b FROM t1,t2 WHERE t1.a=t2.a AND (t1.a=1 OR t1.a=2) AND b>=1 AND b<=3;
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a a b
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2 2 3
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DROP TABLE t1, t2;
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CREATE TABLE t1 (d DATE NOT NULL);
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CREATE TABLE t2 (d DATE NOT NULL);
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INSERT INTO t1 (d) VALUES ('2001-08-01'),('0000-00-00');
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SELECT * FROM t1 LEFT JOIN t2 USING (d) WHERE d IS NULL;
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d
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0000-00-00
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SELECT * from t1 WHERE t1.d IS NULL;
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d
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0000-00-00
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SELECT * FROM t1 WHERE 1/0 IS NULL;
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d
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2001-08-01
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0000-00-00
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DROP TABLE t1,t2;
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CREATE TABLE t1 (
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Document_ID varchar(50) NOT NULL default '',
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Contractor_ID varchar(6) NOT NULL default '',
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Language_ID char(3) NOT NULL default '',
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Expiration_Date datetime default NULL,
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Publishing_Date datetime default NULL,
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Title text,
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Column_ID varchar(50) NOT NULL default '',
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PRIMARY KEY (Language_ID,Document_ID,Contractor_ID)
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);
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INSERT INTO t1 VALUES ('xep80','1','ger','2001-12-31 20:00:00','2001-11-12 10:58:00','Kartenbestellung - jetzt auch online','anle'),('','999998','',NULL,NULL,NULL,'');
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CREATE TABLE t2 (
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Contractor_ID char(6) NOT NULL default '',
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Language_ID char(3) NOT NULL default '',
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Document_ID char(50) NOT NULL default '',
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CanRead char(1) default NULL,
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Customer_ID int(11) NOT NULL default '0',
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PRIMARY KEY (Contractor_ID,Language_ID,Document_ID,Customer_ID)
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);
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INSERT INTO t2 VALUES ('5','ger','xep80','1',999999),('1','ger','xep80','1',999999);
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CREATE TABLE t3 (
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Language_ID char(3) NOT NULL default '',
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Column_ID char(50) NOT NULL default '',
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Contractor_ID char(6) NOT NULL default '',
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CanRead char(1) default NULL,
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Active char(1) default NULL,
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PRIMARY KEY (Language_ID,Column_ID,Contractor_ID)
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);
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INSERT INTO t3 VALUES ('ger','home','1','1','1'),('ger','Test','1','0','0'),('ger','derclu','1','0','0'),('ger','clubne','1','0','0'),('ger','philos','1','0','0'),('ger','clubko','1','0','0'),('ger','clubim','1','1','1'),('ger','progra','1','0','0'),('ger','progvo','1','0','0'),('ger','progsp','1','0','0'),('ger','progau','1','0','0'),('ger','progku','1','0','0'),('ger','progss','1','0','0'),('ger','nachl','1','0','0'),('ger','mitgli','1','0','0'),('ger','mitsu','1','0','0'),('ger','mitbus','1','0','0'),('ger','ergmar','1','1','1'),('ger','home','4','1','1'),('ger','derclu','4','1','1'),('ger','clubne','4','0','0'),('ger','philos','4','1','1'),('ger','clubko','4','1','1'),('ger','clubim','4','1','1'),('ger','progra','4','1','1'),('ger','progvo','4','1','1'),('ger','progsp','4','1','1'),('ger','progau','4','0','0'),('ger','progku','4','1','1'),('ger','progss','4','1','1'),('ger','nachl','4','1','1'),('ger','mitgli','4','0','0'),('ger','mitsu','4','0','0'),('ger','mitbus','4','0','0'),('ger','ergmar','4','1','1'),('ger','progra2','1','0','0'),('ger','archiv','4','1','1'),('ger','anmeld','4','1','1'),('ger','thema','4','1','1'),('ger','edito','4','1','1'),('ger','madis','4','1','1'),('ger','enma','4','1','1'),('ger','madis','1','1','1'),('ger','enma','1','1','1'),('ger','vorsch','4','0','0'),('ger','veranst','4','0','0'),('ger','anle','4','1','1'),('ger','redak','4','1','1'),('ger','nele','4','1','1'),('ger','aukt','4','1','1'),('ger','callcenter','4','1','1'),('ger','anle','1','0','0');
|
|
delete from t1 where Contractor_ID='999998';
|
|
insert into t1 (Contractor_ID) Values ('999998');
|
|
SELECT DISTINCT COUNT(t1.Title) FROM t1,
|
|
t2, t3 WHERE
|
|
t1.Document_ID='xep80' AND t1.Contractor_ID='1' AND
|
|
t1.Language_ID='ger' AND '2001-12-21 23:14:24' >=
|
|
Publishing_Date AND '2001-12-21 23:14:24' <= Expiration_Date AND
|
|
t1.Document_ID = t2.Document_ID AND
|
|
t1.Language_ID = t2.Language_ID AND
|
|
t1.Contractor_ID = t2.Contractor_ID AND (
|
|
t2.Customer_ID = '4' OR
|
|
t2.Customer_ID = '999999' OR
|
|
t2.Customer_ID = '1' )AND t2.CanRead
|
|
= '1' AND t1.Column_ID=t3.Column_ID AND
|
|
t1.Language_ID=t3.Language_ID AND (
|
|
t3.Contractor_ID = '4' OR
|
|
t3.Contractor_ID = '999999' OR
|
|
t3.Contractor_ID = '1') AND
|
|
t3.CanRead='1' AND t3.Active='1';
|
|
COUNT(t1.Title)
|
|
1
|
|
SELECT DISTINCT COUNT(t1.Title) FROM t1,
|
|
t2, t3 WHERE
|
|
t1.Document_ID='xep80' AND t1.Contractor_ID='1' AND
|
|
t1.Language_ID='ger' AND '2001-12-21 23:14:24' >=
|
|
Publishing_Date AND '2001-12-21 23:14:24' <= Expiration_Date AND
|
|
t1.Document_ID = t2.Document_ID AND
|
|
t1.Language_ID = t2.Language_ID AND
|
|
t1.Contractor_ID = t2.Contractor_ID AND (
|
|
t2.Customer_ID = '4' OR
|
|
t2.Customer_ID = '999999' OR
|
|
t2.Customer_ID = '1' )AND t2.CanRead
|
|
= '1' AND t1.Column_ID=t3.Column_ID AND
|
|
t1.Language_ID=t3.Language_ID AND (
|
|
t3.Contractor_ID = '4' OR
|
|
t3.Contractor_ID = '999999' OR
|
|
t3.Contractor_ID = '1') AND
|
|
t3.CanRead='1' AND t3.Active='1';
|
|
COUNT(t1.Title)
|
|
1
|
|
drop table t1,t2,t3;
|
|
CREATE TABLE t1 (
|
|
t1_id int(11) default NULL,
|
|
t2_id int(11) default NULL,
|
|
type enum('Cost','Percent') default NULL,
|
|
cost_unit enum('Cost','Unit') default NULL,
|
|
min_value double default NULL,
|
|
max_value double default NULL,
|
|
t3_id int(11) default NULL,
|
|
item_id int(11) default NULL
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (12,5,'Percent','Cost',-1,0,-1,-1),(14,4,'Percent','Cost',-1,0,-1,-1),(18,5,'Percent','Cost',-1,0,-1,-1),(19,4,'Percent','Cost',-1,0,-1,-1),(20,5,'Percent','Cost',100,-1,22,291),(21,5,'Percent','Cost',100,-1,18,291),(22,1,'Percent','Cost',100,-1,6,291),(23,1,'Percent','Cost',100,-1,21,291),(24,1,'Percent','Cost',100,-1,9,291),(25,1,'Percent','Cost',100,-1,4,291),(26,1,'Percent','Cost',100,-1,20,291),(27,4,'Percent','Cost',100,-1,7,202),(28,1,'Percent','Cost',50,-1,-1,137),(29,2,'Percent','Cost',100,-1,4,354),(30,2,'Percent','Cost',100,-1,9,137),(93,2,'Cost','Cost',-1,10000000,-1,-1);
|
|
CREATE TABLE t2 (
|
|
id int(10) unsigned NOT NULL auto_increment,
|
|
name varchar(255) default NULL,
|
|
PRIMARY KEY (id)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (1,'s1'),(2,'s2'),(3,'s3'),(4,'s4'),(5,'s5');
|
|
select t1.*, t2.* from t1, t2 where t2.id=t1.t2_id limit 2;
|
|
t1_id t2_id type cost_unit min_value max_value t3_id item_id id name
|
|
22 1 Percent Cost 100 -1 6 291 1 s1
|
|
23 1 Percent Cost 100 -1 21 291 1 s1
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (
|
|
siteid varchar(25) NOT NULL default '',
|
|
emp_id varchar(30) NOT NULL default '',
|
|
rate_code varchar(10) default NULL,
|
|
UNIQUE KEY site_emp (siteid,emp_id),
|
|
KEY siteid (siteid)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES ('rivercats','psmith','cust'), ('rivercats','KWalker','cust');
|
|
CREATE TABLE t2 (
|
|
siteid varchar(25) NOT NULL default '',
|
|
rate_code varchar(10) NOT NULL default '',
|
|
base_rate float NOT NULL default '0',
|
|
PRIMARY KEY (siteid,rate_code),
|
|
FULLTEXT KEY rate_code (rate_code)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES ('rivercats','cust',20);
|
|
SELECT rate_code, lr.base_rate FROM t1 AS emp LEFT JOIN t2 AS lr USING (siteid, rate_code) WHERE emp.emp_id = 'psmith' AND siteid = 'rivercats';
|
|
rate_code base_rate
|
|
cust 20
|
|
SELECT rate_code, lr.base_rate FROM t1 AS emp LEFT JOIN t2 AS lr USING (siteid, rate_code) WHERE siteid = 'rivercats' AND emp.emp_id = 'psmith';
|
|
rate_code base_rate
|
|
cust 20
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (ID INTEGER NOT NULL PRIMARY KEY, Value1 VARCHAR(255));
|
|
CREATE TABLE t2 (ID INTEGER NOT NULL PRIMARY KEY, Value2 VARCHAR(255));
|
|
INSERT INTO t1 VALUES (1, 'A');
|
|
INSERT INTO t2 VALUES (1, 'B');
|
|
SELECT * FROM t1 NATURAL JOIN t2 WHERE 1 AND (Value1 = 'A' AND Value2 <> 'B');
|
|
ID Value1 Value2
|
|
SELECT * FROM t1 NATURAL JOIN t2 WHERE 1 AND Value1 = 'A' AND Value2 <> 'B';
|
|
ID Value1 Value2
|
|
SELECT * FROM t1 NATURAL JOIN t2 WHERE (Value1 = 'A' AND Value2 <> 'B') AND 1;
|
|
ID Value1 Value2
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (a int);
|
|
CREATE TABLE t2 (b int);
|
|
CREATE TABLE t3 (c int);
|
|
SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
|
|
a b c
|
|
DROP TABLE t1, t2, t3;
|
|
create table t1 (i int);
|
|
create table t2 (i int);
|
|
create table t3 (i int);
|
|
insert into t1 values(1),(2);
|
|
insert into t2 values(2),(3);
|
|
insert into t3 values (2),(4);
|
|
select * from t1 natural left join t2;
|
|
i
|
|
1
|
|
2
|
|
select * from t1 left join t2 on (t1.i=t2.i);
|
|
i i
|
|
1 NULL
|
|
2 2
|
|
select * from t1 natural left join t2 natural left join t3;
|
|
i
|
|
1
|
|
2
|
|
select * from t1 left join t2 on (t1.i=t2.i) left join t3 on (t2.i=t3.i);
|
|
i i i
|
|
1 NULL NULL
|
|
2 2 2
|
|
select * from t3 natural right join t2;
|
|
i
|
|
2
|
|
3
|
|
select * from t3 right join t2 on (t3.i=t2.i);
|
|
i i
|
|
2 2
|
|
NULL 3
|
|
select * from t3 natural right join t2 natural right join t1;
|
|
i
|
|
1
|
|
2
|
|
select * from t3 right join t2 on (t3.i=t2.i) right join t1 on (t2.i=t1.i);
|
|
i i i
|
|
NULL NULL 1
|
|
2 2 2
|
|
select * from t1,t2 natural left join t3 order by 1,2;
|
|
i i
|
|
1 2
|
|
1 3
|
|
2 2
|
|
2 3
|
|
select * from t1,t2 left join t3 on (t2.i=t3.i) order by t1.i,t2.i,t3.i;
|
|
i i i
|
|
1 2 2
|
|
1 3 NULL
|
|
2 2 2
|
|
2 3 NULL
|
|
select * from t2 natural left join t3,t1 order by t1.i;
|
|
i i
|
|
2 1
|
|
3 1
|
|
2 2
|
|
3 2
|
|
select t1.i,t2.i,t3.i from t2 left join t3 on (t2.i=t3.i),t1 order by t1.i,t2.i,t3.i;
|
|
i i i
|
|
1 2 2
|
|
1 3 NULL
|
|
2 2 2
|
|
2 3 NULL
|
|
select * from t1,t2 natural right join t3 order by 1,2;
|
|
i i
|
|
1 2
|
|
1 4
|
|
2 2
|
|
2 4
|
|
select * from t1,t2 right join t3 on (t2.i=t3.i) order by t1.i,t2.i,t3.i;
|
|
i i i
|
|
1 NULL 4
|
|
1 2 2
|
|
2 NULL 4
|
|
2 2 2
|
|
select * from t2 natural right join t3,t1 order by t1.i;
|
|
i i
|
|
2 1
|
|
4 1
|
|
2 2
|
|
4 2
|
|
select t1.i,t2.i,t3.i from t2 right join t3 on (t2.i=t3.i),t1 order by t1.i,t2.i,t3.i;
|
|
i i i
|
|
1 NULL 4
|
|
1 2 2
|
|
2 NULL 4
|
|
2 2 2
|
|
drop table t1,t2,t3;
|