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