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CREATE TABLE t1 (id INT); DELIMITER $$; CREATE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment1' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ DELIMITER ;$$ CALL proc1(@cnt); SELECT @cnt; INSERT INTO t1 VALUES (1), (2), (3); CALL proc1(@cnt); SELECT @cnt; DELIMITER $$; --error ER_SP_ALREADY_EXISTS CREATE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment2' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ SELECT comment FROM mysql.proc WHERE name='proc1'$$ CREATE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) COMMENT 'comment3' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ SELECT comment FROM mysql.proc WHERE name='proc1'$$ --error ER_WRONG_USAGE CREATE OR REPLACE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) COMMENT 'comment4' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ SELECT comment FROM mysql.proc WHERE name='proc1'$$ CREATE OR REPLACE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment5' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ SELECT comment FROM mysql.proc WHERE name='proc1'$$ DELIMITER ;$$ DROP PROCEDURE proc1; DELIMITER $$; CREATE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ DELIMITER ;$$ INSERT INTO t1 VALUES (1), (2), (3); CALL proc1(@cnt); SELECT @cnt; DROP TABLE IF EXISTS t1; DROP PROCEDURE IF EXISTS proc1; DROP PROCEDURE IF EXISTS proc1;