DATETIME默认值0 MYSQL 5.5.25

Question

我试图创建这些表：

CREATE TABLE IF NOT EXISTS `qa_discountcoupons` (
    `discount_code` INT NOT NULL AUTO_INCREMENT , 
    `status_code` INT NOT NULL , 
    `discount_date` DATETIME NOT NULL DEFAULT 0 , 
    PRIMARY KEY (`discount_code`) , 
    INDEX `discounts_to_status` (`status_code` ASC) , 
    CONSTRAINT `discounts_to_status` 
    FOREIGN KEY (`status_code`) 
    REFERENCES `qa_status` (`status_code`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION) 
ENGINE = InnoDB; 

，但我得到这个错误：

Error Code: 1067. Invalid default value for 'discount_date' 

Answer 1

您可以使用：

CREATE TABLE IF NOT EXISTS `qa_discountcoupons` (
`discount_code` INT NOT NULL AUTO_INCREMENT , 
`status_code` INT NOT NULL , 
`discount_date` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP , 
PRIMARY KEY (`discount_code`) , 
INDEX `discounts_to_status` (`status_code` ASC) , 
CONSTRAINT `discounts_to_status` 
FOREIGN KEY (`status_code`) 
REFERENCES `qa_status` (`status_code`) 
ON DELETE NO ACTION 
ON UPDATE NO ACTION) 
ENGINE = InnoDB; 

来自MySQL 5.6.5及更高版本的

。

我还建议检查How do you set a default value for a MySQL Datetime column?上的线程 - 对此有很多评论。