stored procedure

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MySQL

hi my stored procedure is not working f9 when i use if else loop
in it.plz tell me where mi wrong.the procedure is:

DELIMITER $$
DROP PROCEDURE IF EXISTS `naukri4u`.`reg`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `reg(_action varchar(50))
BEGIN
    IF _action='insert' THEN
    select * from admin;
    END IF;

    END$$
DELIMITER ;