CREATE PROCEDURE delete_repeatUerPermission () BEGIN DECLARE userPermId VARCHAR (32); DECLARE accountId VARCHAR (32); DECLARE permissionId VARCHAR (32); DECLARE _done INT DEFAULT 0; DECLARE _Cur CURSOR FOR SELECT Id AS userPermId, account_id AS accountId, permission_id AS permissionId FROM idb_permission GROUP BY account_id, permission_id, `status` HAVING COUNT(*) > 1 AND `status` = "1"; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET _done = 1; OPEN _Cur; FETCH _Cur INTO userPermId, accountId, permissionId; WHILE (_done <> 1) DO DELETE FROM idb_permission WHERE Id <> userPermId AND account_id = accountId AND permission_id = permissionId AND `status` = "1"; FETCH _Cur INTO userPermId, accountId, permissionId; END WHILE; CLOSE _Cur; END;
MySQL编写存储过程删除重复数据
之前在开发过程中,利用sql查询一个对象是否存在时,总是报异常,异常的意思是说不能把多个对象set进一个对象中,然后通过group by,发现数据中重复数据有十几万条,于是编写了一个存储过程用来删除重复,执行了一下,效率还是超快的,一下是sql。
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