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--disable_warnings DROP TABLE IF EXISTS t1,t2,t3,t4; DROP FUNCTION IF EXISTS sf1; --enable_warnings CREATE TABLE t1 (id INTEGER NULL , data INTEGER NULL, KEY(id)); CREATE TABLE t2 (i INTEGER NULL); CREATE TABLE t3 (id INTEGER NULL, data INTEGER NULL, KEY(id)); CREATE TABLE t4 (i INTEGER NULL); INSERT INTO t1 VALUES(1,1),(2,1),(3,4),(4,5); INSERT INTO t2 VALUES(1),(2),(3); DELIMITER //; CREATE FUNCTION sf1() RETURNS INTEGER BEGIN DECLARE done INT DEFAULT 0; DECLARE a CHAR(16); DECLARE b,c INT; DECLARE cur1 CURSOR FOR SELECT id,data FROM t1; DECLARE cur2 CURSOR FOR SELECT i FROM t2; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1; OPEN cur1; OPEN cur2; REPEAT FETCH cur1 INTO a, b; FETCH cur2 INTO c; IF NOT done THEN IF b < c THEN INSERT INTO t3 VALUES (a,b); ELSE INSERT INTO t3 VALUES (a,c); END IF; END IF; UNTIL done END REPEAT; CLOSE cur1; CLOSE cur2; RETURN 0; END// DELIMITER ;// SELECT sf1(); SELECT * FROM t1 ORDER BY id; SELECT * FROM t2 ORDER BY i; SELECT * FROM t3 ORDER BY id; INSERT INTO t4 VALUES(sf1()); SELECT * FROM t1 ORDER BY id; SELECT * FROM t2 ORDER BY i; SELECT * FROM t3 ORDER BY id; UPDATE t4 SET i = sf1() + 1 WHERE i = sf1(); SELECT * FROM t1 ORDER BY id; SELECT * FROM t2 ORDER BY i; SELECT * FROM t3 ORDER BY id; DELETE FROM t4 WHERE i = sf1() + 1; SELECT * FROM t1 ORDER BY id; SELECT * FROM t2 ORDER BY i; SELECT * FROM t3 ORDER BY id; DROP FUNCTION sf1; DROP TABLE t1,t2,t3,t4;