Mysql trigger #1064 error - mysql

Question

I'm trying to write a trigger to solve innodb auto_increment problem. I want to make orderID is auto_increment however innodb does not allow me. Here is ORDER table
CREATE TABLE IF NOT EXISTS `ORDER` (
`placeID` INT UNSIGNED NOT NULL,
`orderID` INT UNSIGNED NOT NULL,
`userID` INT UNSIGNED NOT NULL ,
`tableNum` SMALLINT NOT NULL,
`orderStatus` TINYINT NOT NULL,
`orderDate` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`placeID`,`orderID`),
FOREIGN KEY (`userID`) REFERENCES `USER` (`userID`),
FOREIGN KEY (`placeID`) REFERENCES `PLACE` (`placeID`))
ENGINE=InnoDB;
Here is the trigger
delimiter $$
DROP TRIGGER /*!50032 IF EXISTS */ `ORDER_TRIGGER` $$
CREATE TRIGGER `ORDER_TRIGGER` BEFORE INSERT ON `ORDER`
FOR EACH ROW
BEGIN
DECLARE orderID INT UNSIGNED;
SELECT MAX(`orderID`) INTO orderID FROM `ORDER` WHERE `placeID` = NEW.placeID;
IF orderID IS NULL THEN
orderID = 1;
END IF;
SET NEW.orderID = orderID+1;
END;
$$
delimiter;
When I execute this script I get this error.
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '= 1;
END IF;
SET NEW.orderID = orderID+1;
END' at line 7
Can anybody help me? I looked at google but I can't find accurate solution.

Answer 1

I found my mistake. This is right code.
delimiter $$
DROP TRIGGER /*!50032 IF EXISTS */ `ORDER_TRIGGER` $$
CREATE TRIGGER `ORDER_TRIGGER` BEFORE INSERT ON `ORDER`
FOR EACH ROW
BEGIN
DECLARE orderID INT UNSIGNED;
SELECT MAX(`ORDER`.`orderID`) AS ID INTO orderID FROM `ORDER` WHERE `ORDER`.`placeID` = NEW.placeID;
IF orderID IS NULL THEN
SET orderID = 0;
END IF;
SET NEW.orderID = orderID+1;
END;
$$