1drop table if exists t1;
2CREATE TABLE t1 (a int, unique (a), b int not null, unique(b), c int not null, index(c));
3replace into t1 values (1,1,1),(2,2,2),(3,1,3);
4select * from t1;
5a	b	c
63	1	3
72	2	2
8check table t1;
9Table	Op	Msg_type	Msg_text
10test.t1	check	status	OK
11drop table t1;
12