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User : www-data

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User : www-data ( 33)
PHP Version : 7.2.24-0ubuntu0.18.04.17
Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,
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Directory : /www/server/mysql/mysql-test/r/

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Current File : /www/server/mysql/mysql-test/r/key_diff.result

drop table if exists t1;
CREATE TABLE t1 (
a char(5) NOT NULL,
b char(4) NOT NULL,
KEY (a),
KEY (b)
);
INSERT INTO t1 VALUES ('A','B'),('b','A'),('C','c'),('D','E'),('a','a');
select * from t1,t1 as t2;
a	b	a	b
A	B	A	B
b	A	A	B
C	c	A	B
D	E	A	B
a	a	A	B
A	B	b	A
b	A	b	A
C	c	b	A
D	E	b	A
a	a	b	A
A	B	C	c
b	A	C	c
C	c	C	c
D	E	C	c
a	a	C	c
A	B	D	E
b	A	D	E
C	c	D	E
D	E	D	E
a	a	D	E
A	B	a	a
b	A	a	a
C	c	a	a
D	E	a	a
a	a	a	a
explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	
1	SIMPLE	t2	ALL	b	NULL	NULL	NULL	5	Using where; Using join buffer
select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
a	b	a	b
A	B	a	a
A	B	b	A
C	c	C	c
a	a	a	a
a	a	b	A
b	A	A	B
select * from t1 where a='a';
a	b
A	B
a	a
drop table t1;

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