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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Comment
t1 0 PRIMARY 1 a NULL NULL NULL NULL
a b
2 2
3 3
4 4
a b
4 4
a b
2 2
3 3
4 6
a b
1 1
2 2
3 3
4 4
a
869751
802616
a
869751
802616
a
736494
a
736494
869751
a
226312
736494
802616
869751
table type possible_keys key key_len ref rows Extra
t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
x y
1 3
1 1
x y x y
1 1 1 1
2 2 2 2
1 3 1 1
2 4 2 2
2 5 2 2
2 6 2 2
table type possible_keys key key_len ref rows Extra
t1 ALL x NULL NULL NULL 6
t2 eq_ref y y 4 t1.x 1
max(a)
1
a b
1 6
1 5
1 4
1 3
1 2
1 1
a b
1 6
1 5
1 4
1 3
1 2
1 1
1 6
1 5
1 4
1 3
1 2
1 1
max(id)
1
max(id)
2
f1 f2
16 ted
12 ted
12 ted
12 ted
12 ted
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
btn
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 11 const,const 10 where used
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