第8到第11题基于这样的三个表即学生表S、课程表C和学生选课表SC,它们的结构如下: S(S#, SN, SEX, AGE, DEPT) C(C#, CN) SC(S#, C#, GRADE)
A.
SELECT SN, AGE, SEX FROM S WHERE AGE>(SELECT AGE FROM S WHERE SN=’’)
B.
SELECT SN, AGE, SEX FROM S WHERE SN=’’
C.
SELECT SN, AGE, SEX FROM S WHERE AGE>(SELECT AGE WHERE SN=’’)
D.
SELECT SN, AGE, SEX FROM S WHERE AGE>华.AGE