智慧职教: 执行完下面的SQL语句，goods表中有几条记录？DROP TABLE IF EXISTS sCarInfo；CREATE TABLE sCarInfo(gdID INT ,uID INT,scNum INT,PRIMARY KEY(gdID,uID)) CHARSET utf8；INSERT INTO sCarInfo VALUES(1,1,2)；INSERT INTO sCarInfo VALUES(1,1,3)；INSERT INTO sCarInfo VALUES(2,1,2)；INSERT INTO sCarInfo VALUES(1,2,2)；INSERT INTO sCarInfo VALUES(1,null,2)；INSERT INTO sCarInfo VALUES(null,1,2)；

智慧职教: 购物车表sCarInfo定义如下，下面说法错误的是：DROP TABLE IF EXISTS sCarInfo；CREATE TABLE sCarInfo(gdID INT ,--商品IDuID INT,--用户IDscNum INT，--购买数量scTime DATETIME--购买时间) CHARSET utf8；