＃1064 - 您的SQL語法錯誤;

Question

CREATE TABLE `mealorder`.`order_item` 
(`order_id` INT(20) NOT NULL AUTO_INCREMENT , 
    `user_id` INT(20) NOT NULL , 
    `item_type` VARCHAR(50) NOT NULL , 
    `item_price` DOUBLE(20) NOT NULL , 
    `item_quantity` INT(20) NULL , 
    `date_time` DATETIME(5) NULL , 
    `total_price` DOUBLE(20) NULL , 
    PRIMARY KEY (`order_id`(20))) ENGINE = InnoDB; 

Answer 1

CREATE TABLE IF NOT EXISTS `order_item` (
    `order_id` int(11) NOT NULL AUTO_INCREMENT, 
    `user_id` int(11) NOT NULL, 
    `item_type` varchar(50) NOT NULL, 
    `item_price` double NOT NULL, 
    `item_quantity` int(11) NOT NULL, 
    `date_time` datetime NOT NULL, 
    `total_price` double NOT NULL, 
    PRIMARY KEY (`order_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 
AUTO_INCREMENT=1 ;