MySQL allows you to loop statement for executing a block repeatedly based on a condition. These are like WHILE, REPEAT and LOOP.
It checks the expression at the beginning of each iteration.
Example:
DELIMITER $$ CREATE PROCEDURE MyWhileLoop() BEGIN DECLARE x INT; SET x = 1; WHILE x <= 10 DO SET x = x + 1; END WHILE; SELECT x; END$$ DELIMITER;
It checks the expression after the execution of statements.
DELIMITER $$ CREATE PROCEDURE MyRepeatLoop() BEGIN DECLARE x INT; SET x = 1; REPEAT SET x = x + 1; UNTIL x >= 10 END REPEAT; SELECT x; END$$ DELIMITER;
It execute a statement repeatedly with an additional option.
DELIMITER $$ CREATE PROCEDURE MyLOOPLoop() BEGIN DECLARE x INT; SET x = 1; loop_label: LOOP IF x >= 10 THEN LEAVE loop_label; END IF; IF (x mod 2) THEN ITERATE loop_label; ELSE SET x = x + 1; END IF; END LOOP; SELECT x; END$$ DELIMITER ;
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