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drop table if exists tt;
create table tt (a int, b int, key(a,b));
insert into tt values (0,0),(0,1),(1,0),(1,1);
show indexes from tt;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
tt 1 a 1 a A NULL NULL NULL YES BTREE
tt 1 a 2 b A NULL NULL NULL YES BTREE
analyze table tt;
Table Op Msg_type Msg_text
test.tt analyze status OK
show indexes from tt;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
tt 1 a 1 a A 2 NULL NULL YES BTREE
tt 1 a 2 b A 4 NULL NULL YES BTREE
flush tables;
show indexes from tt;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
tt 1 a 1 a A 2 NULL NULL YES BTREE
tt 1 a 2 b A 4 NULL NULL YES BTREE
drop table tt;
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