DBI202Xuất hiện trong 2 đề thi
Given the table Student(StudId, StudName), table Subject(SubId, SubName) and test score table (StudId, SubName, MarkExam). Suppose we need to query: "Find students who have never taken the Arithmetic exam", Which of the following operations can we use in SQL statements?
Các lựa chọn
Anot in
Bnot exists
Cnot in or not exists
Dnot in and not exists at the same time
ENone of the mentioned answers