table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a	a	5	const	3	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	9	const,const	1	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	9	const,const	1	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	const	a,b	a	9	const,const	1	
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	index	NULL	a	9	NULL	12	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a,b	a	9	NULL	3	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	b	4	const	2	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a,b	a	9	NULL	2	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a	a	5	NULL	1	where used; Using index
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a	a	5	NULL	1	where used; Using index
a	b
NULL	7
NULL	9
NULL	9
a	b
NULL	7
a	b
1	1
2	2
a	b
1	1
2	2
a	b
NULL	9
NULL	9
a	b
NULL	7
7	7
a	b
NULL	7
NULL	9
NULL	9
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	1	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ALL	NULL	NULL	NULL	NULL	12	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a,b	a	5	NULL	12	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a,b	a	5	NULL	4	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	a,b	a	5	const	3	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a	a	5	NULL	1	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a,b	a	5	NULL	4	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	a	a	5	NULL	1	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	range	b	b	12	NULL	1	where used
a	b	c
NULL	7	0
NULL	9	0
NULL	9	0
a	b	c
NULL	7	0
a	b	c
1	1	0
2	2	0
a	b	c
1	1	0
2	2	0
a	b	c
NULL	9	0
NULL	9	0
a	b	c
NULL	7	0
7	7	0
a	b	c
NULL	7	0
NULL	9	0
NULL	9	0
a	b	c
6	6	0
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	idx1	idx1	5	const	1	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	const	idx1	idx1	5	const	1	
id
101
102
105
106
109
110
id
101
102
105
106
109
110
id	uniq_id
3	1
4	2
7	3
8	4
id	uniq_id
3	1
4	2
7	3
8	4