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~~~ DROP TABLE IF EXISTS `shop_cart`; CREATE TABLE IF NOT EXISTS `shop_cart`( `cartid` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT "购物车id", `productid` BIGINT UNSIGNED NOT NULL DEFAULT '0' COMMENT "商品的id", `productnum` INT UNSIGNED NOT NULL DEFAULT '0' COMMENT "商品的数量", `price` DECIMAL(10,2) NOT NULL DEFAULT '0.00' COMMENT "商品的单价", `userid` BIGINT UNSIGNED NOT NULL DEFAULT '0' COMMENT "用户的id", `createtime` INT UNSIGNED NOT NULL DEFAULT '0' COMMENT "创建时间", KEY shop_cart_productid(`productid`), KEY shop_cart_userid(`userid`) )ENGINE=InnoDB DEFAULT CHARSET='utf8'; ~~~ 了解购物车存储内容 分析数据表字段的设计 购物车 数据表