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DROP TABLE IF EXISTS ids;
CREATE TABLE ids (
id1 INT,
id2 INT
) DEFAULT CHARSET=utf8mb4;
INSERT INTO ids (id1, id2) values (1, 2), (1, 2);
ALTER TABLE ids ADD UNIQUE INDEX (id1, id2);
ERROR 23000: Can't write, because of unique constraint, to table 'ids'
SHOW CREATE TABLE ids;
Table Create Table
ids CREATE TABLE `ids` (
`id1` int(11) DEFAULT NULL,
`id2` int(11) DEFAULT NULL
) ENGINE=Mroonga DEFAULT CHARSET=utf8mb4
SELECT * FROM ids;
id1 id2
1 2
1 2
DROP TABLE ids;
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