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A.select name from teacher where email=null；
B.select name from teacher where email〈〉null；
C.select name from teacher where email is null；
D.select name from teacher where email is not null；

A.select seq.ROWNU Mfrom dual；
B.select seq.ROWID from dual；
C.select seq.CURRVAL from dual；
D.select seq.NEXTVAL from dual；