config root man

CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20),
INDEX (name)) ENGINE=InnoDB;
CREATE TABLE t2 (id int(11) NOT NULL PRIMARY KEY, fkey int(11),
FOREIGN KEY (fkey) REFERENCES t2(id)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,'A1'),(2,'A2'),(3,'B');
INSERT INTO t2 VALUES (1,1),(2,2),(3,2),(4,3),(5,3);
ANALYZE TABLE t1;
ANALYZE TABLE t2;
EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id 
WHERE t1.name LIKE 'A%';
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY,name	name	23	NULL	2	100.00	Using where; Using index
1	SIMPLE	t2	NULL	ref	fkey	fkey	5	test.t1.id	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t2` join `test`.`t1` where ((`test`.`t2`.`fkey` = `test`.`t1`.`id`) and (`test`.`t1`.`name` like 'A%'))
EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id 
WHERE t1.name LIKE 'A%' OR FALSE;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	NULL	index	NULL	fkey	5	NULL	5	100.00	Using index
1	SIMPLE	t1	NULL	eq_ref	PRIMARY	PRIMARY	4	test.t2.fkey	1	33.33	Using where
Warnings:
Note	1003	/* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t2` left join `test`.`t1` on((`test`.`t1`.`id` = `test`.`t2`.`fkey`)) where (`test`.`t1`.`name` like 'A%')
DROP TABLE t1,t2;
#
# BUG#58456: Assertion 0 in QUICK_INDEX_MERGE_SELECT::need_sorted_output
#            in opt_range.h
#
CREATE TABLE t1 (
col_int INT,
col_int_key INT,
pk INT NOT NULL,
PRIMARY KEY (pk),
KEY col_int_key (col_int_key)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (NULL,1,1), (6,2,2), (5,3,3), (NULL,4,4);
INSERT INTO t1 VALUES (1,NULL,6), (8,5,7), (NULL,8,8), (8,NULL,5);
ANALYZE TABLE t1;
CREATE TABLE t2 (
pk INT PRIMARY KEY
) ENGINE=InnoDB;

EXPLAIN SELECT t1.pk
FROM t2 LEFT JOIN t1 ON t2.pk = t1.col_int
WHERE t1.col_int_key BETWEEN 5 AND 6 
AND t1.pk IS NULL OR t1.pk IN (5)
ORDER BY pk;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	NULL	index	PRIMARY	PRIMARY	4	NULL	1	100.00	Using index
1	SIMPLE	t1	NULL	const	PRIMARY,col_int_key	PRIMARY	4	const	1	12.50	Using where
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t2` join `test`.`t1` where ((`test`.`t1`.`col_int` = `test`.`t2`.`pk`) and (((`test`.`t1`.`col_int_key` between 5 and 6) and isnull(`test`.`t1`.`pk`)) or (`test`.`t1`.`pk` = 5))) order by `test`.`t1`.`pk`

SELECT t1.pk
FROM t2 LEFT JOIN t1 ON t2.pk = t1.col_int
WHERE t1.col_int_key BETWEEN 5 AND 6 
AND t1.pk IS NULL OR t1.pk IN (5)
ORDER BY pk;
pk

DROP TABLE t1,t2;
# End BUG#58456
#
# Bug #20939184:INNODB: UNLOCK ROW COULD NOT FIND A 2 MODE LOCK ON THE
#               RECORD
#
CREATE  TABLE t1 (c1 INT, c2 INT, c3 INT, PRIMARY KEY (c1,c2) );
CREATE  TABLE t2 (c1 INT, c2 INT, c3 INT, PRIMARY KEY (c1), KEY (c2));
INSERT INTO t1 VALUES (1,2,3),(2,3,4),(3,4,5);
INSERT INTO t2 SELECT * FROM t1;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
SELECT * FROM t1 LEFT JOIN t2 ON t1.c2=t2.c2 AND t2.c1=1 FOR UPDATE;
c1	c2	c3	c1	c2	c3
1	2	3	1	2	3
2	3	4	NULL	NULL	NULL
3	4	5	NULL	NULL	NULL
UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c2 AND t2.c1 = 3 SET t1.c3 = RAND()*10;
COMMIT;
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
DROP TABLE t1,t2;