A.
SELECT Sname, Sno, Ssex FROM Student WHERE Sname LIKE '';
B.
SELECT Sname, Sno, Ssex FROM Student WHERE Sname LIKE '_';
C.
SELECT Sname, Sno, Ssex FROM Student WHERE Sname LIKE '%';
D.
SELECT Sname, Sno, Ssex FROM Student WHERE Sname not LIKE '%';