[SQL]Brauche Hilfe mit einen SQL-Script

DELIMITER ;
CREATE PROCEDURE updateBan()
BEGIN
    DECLARE @Bann INT;
    UPDATE `Samp`.`gfplayers` SET @Bann = `tBan` WHERE `gfplayers`.`tBan` >0 LIMIT 1 ;
    SET @Bann = @Bann-5;  
    UPDATE `Samp`.`gfplayers` SET `tBan` = @Bann WHERE `gfplayers`.`tBan` =0 LIMIT 1 ;
END;
CALL updateBan();

DELIMITER ;
CREATE PROCEDURE updateBan(IN Bann INT)
BEGIN
    UPDATE `Samp`.`gfplayers` SET Bann = `tBan` WHERE `gfplayers`.`tBan` >0 LIMIT 1 ;
    UPDATE `Samp`.`gfplayers` SET `tBan` = (Bann-5) WHERE `gfplayers`.`tBan` =0 LIMIT 1 ;
END;
CALL updateBan(6);

DELIMITER ;
CREATE PROCEDURE updateBan()
BEGIN
    DECLARE @Bann INT DEFAULT 44;
    UPDATE `Samp`.`gfplayers` SET @Bann = `tBan` WHERE `gfplayers`.`tBan` >0 LIMIT 1 ;
    SET @Bann = @Bann-5;  
    UPDATE `Samp`.`gfplayers` SET `tBan` = @Bann WHERE `gfplayers`.`tBan` =0 LIMIT 1 ;
END;
CALL updateBan();