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)；