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bd5c45dc7a
This is a backport of the fix for MySQL BUG#52317: Assertion failing in Field_varstring::store () at field.cc:6833 The orginal comment by Oystein is: In order for EXPLAIN to print const-refs, a Store_key_const_item object is created. This is different for normal execution of subqueries where a temporary store_key_item object is used instead. The problem is that EXPLAIN will execute subqueries. This leads to a scenario where a store_key_const_item object it told to write to its underlying field. This results in a failing assert since the write set of the underlying table does not reflect this. The resolution is to do the same trick as for store_key_item::copy_inner(). That is, temporarily change the write set to allow writes to all columns. This is only necessary in debug version since non-debug version does not contain asserts on write_set. sql/sql_select.h: Temporarily change write_set in store_key_const_item::copy_inner() to allow initialization of underlying field. This is necessary since subqueries are executed for EXPLAIN. (For normal execution, store_key_item::copy_inner is used.)
453 lines
16 KiB
Text
453 lines
16 KiB
Text
#
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# Bug #46791: Assertion failed:(table->key_read==0),function unknown
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# function,file sql_base.cc
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#
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CREATE TABLE t1 (a INT, b INT, KEY(a));
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INSERT INTO t1 VALUES (1,1),(2,2);
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CREATE TABLE t2 LIKE t1;
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INSERT INTO t2 VALUES (1,1),(2,2);
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CREATE TABLE t3 LIKE t1;
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# should have 1 impossible where and 2 dependent subqueries
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EXPLAIN
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SELECT 1 FROM t1
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WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
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ORDER BY count(*);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 index NULL a 5 NULL 2 Using where; Using index; Using temporary
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
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3 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 0 const row not found
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# should not crash the next statement
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SELECT 1 FROM t1
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WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
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ORDER BY count(*);
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1
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1
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# should not crash: the crash is caused by the previous statement
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SELECT 1;
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1
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1
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DROP TABLE t1,t2,t3;
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#
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# Bug #47106: Crash / segfault on adding EXPLAIN to a non-crashing
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# query
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#
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CREATE TABLE t1 (
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a INT,
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b INT,
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PRIMARY KEY (a),
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KEY b (b)
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);
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INSERT INTO t1 VALUES (1, 1), (2, 1);
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CREATE TABLE t2 LIKE t1;
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INSERT INTO t2 SELECT * FROM t1;
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CREATE TABLE t3 LIKE t1;
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INSERT INTO t3 SELECT * FROM t1;
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# Should not crash.
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# Should have 1 impossible where and 2 dependent subqs.
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EXPLAIN
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SELECT
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(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
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FROM t3 WHERE 1 = 0 GROUP BY 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 Impossible WHERE
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2 DEPENDENT SUBQUERY t1 index NULL PRIMARY 4 NULL 2 Using index
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2 DEPENDENT SUBQUERY t2 index b b 5 NULL 2 Using where; Using index; Using join buffer
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# should return 0 rows
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SELECT
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(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
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FROM t3 WHERE 1 = 0 GROUP BY 1;
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(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
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DROP TABLE t1,t2,t3;
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End of 5.0 tests.
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CREATE TABLE t1 (col_int_nokey int(11) NOT NULL, col_varchar_nokey varchar(1) NOT NULL) engine=myisam;
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INSERT INTO t1 VALUES (2,'s'),(0,'v'),(2,'s');
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CREATE TABLE t2 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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`col_int_key` int(11) NOT NULL,
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col_varchar_key varchar(1) NOT NULL,
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PRIMARY KEY (pk),
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KEY `col_int_key` (`col_int_key`),
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KEY `col_varchar_key` (`col_varchar_key`)
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) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (4,10,'g'), (5,20,'v');
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SELECT t1.col_int_nokey,(SELECT MIN( t2_a.col_int_key ) FROM t2 t2_a, t2 t2_b, t1 t1_a WHERE t1_a.col_varchar_nokey = t2_b.col_varchar_key and t1.col_int_nokey ) as sub FROM t1;
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col_int_nokey sub
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2 10
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0 NULL
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2 10
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SELECT t1.col_int_nokey,(SELECT MIN( t2_a.col_int_key ) +1 FROM t2 t2_a, t2 t2_b, t1 t1_a WHERE t1_a.col_varchar_nokey = t2_b.col_varchar_key and t1.col_int_nokey ) as sub FROM t1;
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col_int_nokey sub
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2 11
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0 NULL
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2 11
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DROP TABLE t1,t2;
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#
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# Bug#54568: create view cause Assertion failed: 0,
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# file .\item_subselect.cc, line 836
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#
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EXPLAIN SELECT 1 LIKE ( 1 IN ( 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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Warnings:
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Note 1249 Select 2 was reduced during optimization
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DESCRIBE SELECT 1 LIKE ( 1 IN ( 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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Warnings:
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Note 1249 Select 2 was reduced during optimization
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# None of the below should crash
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CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
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CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
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DROP VIEW v1, v2;
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#
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# End of 5.1 tests.
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#
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#
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# BUG#46743 "Azalea processing correlated, aggregate SELECT
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# subqueries incorrectly"
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#
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CREATE TABLE t1 (c int);
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INSERT INTO t1 VALUES (NULL);
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CREATE TABLE t2 (d int , KEY (d));
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INSERT INTO t2 VALUES (NULL),(NULL);
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0 rows in subquery
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SELECT 1 AS RESULT FROM t2,t1 WHERE d = c;
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RESULT
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base query
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SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ;
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RESULT
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NULL
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EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
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2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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Warnings:
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Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
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Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1`
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first equivalent variant
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SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c ;
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RESULT
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NULL
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EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
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2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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Warnings:
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Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
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Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1` group by NULL
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second equivalent variant
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SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
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RESULT
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NULL
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EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
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2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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Warnings:
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Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
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Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1` group by NULL
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DROP TABLE t1,t2;
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#
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# BUG#45928 "Differing query results depending on MRR and
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# engine_condition_pushdown settings"
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#
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CREATE TABLE `t1` (
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`pk` int(11) NOT NULL AUTO_INCREMENT,
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`time_nokey` time NOT NULL,
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`varchar_key` varchar(1) NOT NULL,
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`varchar_nokey` varchar(1) NOT NULL,
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PRIMARY KEY (`pk`),
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KEY `varchar_key` (`varchar_key`)
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) AUTO_INCREMENT=12 DEFAULT CHARSET=latin1;
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INSERT INTO `t1` VALUES (10,'00:00:00','i','i'),(11,'00:00:00','','');
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set @old_optimizer_switch = @@session.optimizer_switch,
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@old_optimizer_use_mrr = @@session.optimizer_use_mrr,
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@old_engine_condition_pushdown = @@session.engine_condition_pushdown;
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SET SESSION OPTIMIZER_SWITCH = 'materialization=off,semijoin=off,loosescan=off,firstmatch=off';
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SET SESSION optimizer_use_mrr = 'force';
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SET SESSION engine_condition_pushdown = 1;
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SELECT `time_nokey` G1 FROM t1 WHERE ( `varchar_nokey` , `varchar_key` ) IN (
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SELECT `varchar_nokey` , `varchar_nokey` ) AND `varchar_key` >= 'c' HAVING G1 ORDER
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BY `pk` ;
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G1
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set @@session.optimizer_switch = @old_optimizer_switch,
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@@session.optimizer_use_mrr = @old_optimizer_use_mrr,
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@@session.engine_condition_pushdown = @old_engine_condition_pushdown;
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DROP TABLE t1;
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#
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# BUG#45863 "Assertion failed: (fixed == 0), function fix_fields(),
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# file item.cc, line 4448"
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#
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DROP TABLE IF EXISTS C, BB;
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CREATE TABLE C (
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varchar_nokey varchar(1) NOT NULL
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);
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INSERT INTO C VALUES
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('k'),('a'),(''),('u'),('e'),('v'),('i'),
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('t'),('u'),('f'),('u'),('m'),('j'),('f'),
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('v'),('j'),('g'),('e'),('h'),('z');
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CREATE TABLE BB (
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varchar_nokey varchar(1) NOT NULL
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);
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INSERT INTO BB VALUES ('i'),('t');
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SELECT varchar_nokey FROM C
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WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey
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FROM BB);
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ERROR 21000: Operand should contain 2 column(s)
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SELECT varchar_nokey FROM C
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WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey, varchar_nokey
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FROM BB);
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ERROR 42S22: Unknown column 'OUTR' in 'IN/ALL/ANY subquery'
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DROP TABLE C,BB;
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#
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# During work with BUG#45863 I had problems with a query that was
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# optimized differently in regular and prepared mode.
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# Because there was a bug in one of the selected strategies, I became
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# aware of the problem. Adding an EXPLAIN query to catch this.
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DROP TABLE IF EXISTS t1, t2, t3;
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CREATE TABLE t1
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(EMPNUM CHAR(3) NOT NULL,
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EMPNAME CHAR(20),
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GRADE DECIMAL(4),
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CITY CHAR(15));
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CREATE TABLE t2
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(PNUM CHAR(3) NOT NULL,
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PNAME CHAR(20),
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PTYPE CHAR(6),
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BUDGET DECIMAL(9),
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CITY CHAR(15));
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CREATE TABLE t3
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(EMPNUM CHAR(3) NOT NULL,
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PNUM CHAR(3) NOT NULL,
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HOURS DECIMAL(5));
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INSERT INTO t1 VALUES ('E1','Alice',12,'Deale');
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INSERT INTO t1 VALUES ('E2','Betty',10,'Vienna');
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INSERT INTO t1 VALUES ('E3','Carmen',13,'Vienna');
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INSERT INTO t1 VALUES ('E4','Don',12,'Deale');
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INSERT INTO t1 VALUES ('E5','Ed',13,'Akron');
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INSERT INTO t2 VALUES ('P1','MXSS','Design',10000,'Deale');
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INSERT INTO t2 VALUES ('P2','CALM','Code',30000,'Vienna');
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INSERT INTO t2 VALUES ('P3','SDP','Test',30000,'Tampa');
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INSERT INTO t2 VALUES ('P4','SDP','Design',20000,'Deale');
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INSERT INTO t2 VALUES ('P5','IRM','Test',10000,'Vienna');
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INSERT INTO t2 VALUES ('P6','PAYR','Design',50000,'Deale');
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INSERT INTO t3 VALUES ('E1','P1',40);
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INSERT INTO t3 VALUES ('E1','P2',20);
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INSERT INTO t3 VALUES ('E1','P3',80);
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INSERT INTO t3 VALUES ('E1','P4',20);
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INSERT INTO t3 VALUES ('E1','P5',12);
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INSERT INTO t3 VALUES ('E1','P6',12);
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INSERT INTO t3 VALUES ('E2','P1',40);
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INSERT INTO t3 VALUES ('E2','P2',80);
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INSERT INTO t3 VALUES ('E3','P2',20);
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INSERT INTO t3 VALUES ('E4','P2',20);
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INSERT INTO t3 VALUES ('E4','P4',40);
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INSERT INTO t3 VALUES ('E4','P5',80);
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SET @old_optimizer_switch = @@session.optimizer_switch;
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SET @old_join_cache_level = @@session.join_cache_level;
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SET SESSION optimizer_switch = 'firstmatch=on,loosescan=on,materialization=on,semijoin=on';
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SET SESSION join_cache_level = 1;
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CREATE UNIQUE INDEX t1_IDX ON t1(EMPNUM);
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EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'));
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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 t1_IDX NULL NULL NULL 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'))";
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EXECUTE stmt;
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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 t1_IDX NULL NULL NULL 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
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1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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DEALLOCATE PREPARE stmt;
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DROP INDEX t1_IDX ON t1;
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CREATE INDEX t1_IDX ON t1(EMPNUM);
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EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'));
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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 t1_IDX NULL NULL NULL 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'))";
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EXECUTE stmt;
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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 t1_IDX NULL NULL NULL 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
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1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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DEALLOCATE PREPARE stmt;
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DROP INDEX t1_IDX ON t1;
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EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'));
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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 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
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FROM t1
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WHERE EMPNUM IN
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(SELECT EMPNUM
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FROM t3
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WHERE PNUM IN
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(SELECT PNUM
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FROM t2
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WHERE PTYPE = 'Design'))";
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EXECUTE stmt;
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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 5
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1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 5
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1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer
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DEALLOCATE PREPARE stmt;
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SET SESSION optimizer_switch = @old_optimizer_switch;
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SET SESSION join_cache_level = @old_join_cache_level;
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DROP TABLE t1, t2, t3;
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#
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# BUG#45221 Query SELECT pk FROM C WHERE pk IN (SELECT int_key) failing
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#
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CREATE TABLE t1 (
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i1_key INT,
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i2 INT,
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i3 INT,
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KEY i1_index (i1_key)
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);
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INSERT INTO t1 VALUES (9,1,2), (9,2,1);
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CREATE TABLE t2 (
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pk INT NOT NULL,
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i1 INT,
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PRIMARY KEY (pk)
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);
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INSERT INTO t2 VALUES (9,1);
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# Enable Index condition pushdown
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SELECT @old_icp:=@@engine_condition_pushdown;
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@old_icp:=@@engine_condition_pushdown
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#
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SET SESSION engine_condition_pushdown = 'ON';
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SELECT pk
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FROM t2
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WHERE
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pk IN (
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SELECT i1_key
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FROM t1
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WHERE t1.i2 < t1.i3 XOR t2.i1 > 1
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ORDER BY t1.i2 desc);
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pk
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9
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# Restore old value for Index condition pushdown
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SET SESSION engine_condition_pushdown=@old_icp;
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DROP TABLE t1,t2;
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#
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# LP BUG#641203 Query returns rows where no result is expected (impossible WHERE)
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#
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CREATE TABLE t1 (c1 varchar(1) DEFAULT NULL);
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CREATE TABLE t2 (c1 varchar(1) DEFAULT NULL);
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INSERT INTO t2 VALUES ('k'), ('d');
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CREATE TABLE t3 (c1 varchar(1) DEFAULT NULL);
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INSERT INTO t3 VALUES ('a'), ('b'), ('c');
|
|
CREATE TABLE t4 (c1 varchar(1) primary key);
|
|
INSERT INTO t4 VALUES ('k'), ('d');
|
|
EXPLAIN
|
|
SELECT * FROM t1 RIGHT JOIN t2 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
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 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
|
SELECT * FROM t1 RIGHT JOIN t2 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
c1 c1
|
|
EXPLAIN
|
|
SELECT * FROM t2 LEFT JOIN t1 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
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 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
|
SELECT * FROM t2 LEFT JOIN t1 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
c1 c1
|
|
EXPLAIN
|
|
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
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 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
|
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
c1 c1 c1
|
|
EXPLAIN
|
|
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
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 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
|
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
|
|
c1 c1
|
|
drop table t1, t2, t3, t4;
|
|
#
|
|
# BUG#52317: Assertion failing in Field_varstring::store()
|
|
# at field.cc:6833
|
|
#
|
|
CREATE TABLE t1 (i INTEGER);
|
|
INSERT INTO t1 VALUES (1);
|
|
CREATE TABLE t2 (i INTEGER, KEY k(i));
|
|
INSERT INTO t2 VALUES (1), (2);
|
|
EXPLAIN
|
|
SELECT i FROM t1 WHERE (1) NOT IN (SELECT i FROM t2);
|
|
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 DEPENDENT SUBQUERY t2 index_subquery k k 5 const 2 Using index
|
|
DROP TABLE t2;
|
|
DROP TABLE t1;
|