A.delete student where sex in(NULL) B.delete student where sex=NULL C.delete student where sex is NULL D.delete student where is NULL(sex,O)is NULL
A.更新了多行數(shù)據(jù) B.沒有數(shù)據(jù)更新 C.更新了一行數(shù)據(jù) D.出現(xiàn)錯誤
A.Insert into student(sid,sname)values(1,’Jack’) B.Insert into student(sid,sname)values(1,"jack") C.Insert into student values(1,"jack") D.Insert into student values(’jack’)