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create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
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Table Unique Key_name Seq_in_index Column_name
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CREATE TABLE t1 (c VARCHAR(10) NOT NULL,i INT PRIMARY KEY NOT NULL AUTO_INCREMENT, UNIQUE (c,i));
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INSERT INTO t1 (c) VALUES (NULL),(NULL);