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CREATE TABLE t1 (id INT); CREATE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment1' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ CALL proc1(@cnt); SELECT @cnt; @cnt 0 INSERT INTO t1 VALUES (1), (2), (3); CALL proc1(@cnt); SELECT @cnt; @cnt 3 CREATE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment2' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ ERROR 42000: PROCEDURE proc1 already exists SELECT comment FROM mysql.proc WHERE name='proc1'$$ comment comment1 CREATE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) COMMENT 'comment3' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ Warnings: Note 1304 PROCEDURE proc1 already exists SELECT comment FROM mysql.proc WHERE name='proc1'$$ comment comment1 CREATE OR REPLACE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) COMMENT 'comment4' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS SELECT comment FROM mysql.proc WHERE name='proc1'$$ comment comment1 CREATE OR REPLACE PROCEDURE proc1 (OUT cnt INT) COMMENT 'comment5' BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ SELECT comment FROM mysql.proc WHERE name='proc1'$$ comment comment5 DROP PROCEDURE proc1; CREATE PROCEDURE IF NOT EXISTS proc1 (OUT cnt INT) BEGIN SELECT COUNT(*) INTO cnt FROM t1; END$$ INSERT INTO t1 VALUES (1), (2), (3); CALL proc1(@cnt); SELECT @cnt; @cnt 6 DROP TABLE IF EXISTS t1; DROP PROCEDURE IF EXISTS proc1; DROP PROCEDURE IF EXISTS proc1; Warnings: Note 1305 PROCEDURE test.proc1 does not exist