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WHERE SA NOT BETWEEN 20 AND 23 SELECT XM,SA,SDFROM STUD
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SELECT XM,SAFROM STUD FOR SA<20 SELECT XM,SA FROM STUD WHERE NOT SA>=20 SELECT XM,SA ON STUD FOR SA<20 SELECT XM,SA ON STUD WHERE SA<20
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Sa5-Sa8 Sa4-Sa8 Sa1-Sa5 Sa1-Sa4
。实现该功能的正确SQL语句是______。A) SELECT XM,SA FROM STUD FOR SA<20 SELECT XM,SA FROM STUD WHERE NOT SA>=20 SELECT XM,SA ON STUD FOR SA<20 SELECT XM,SA ON STUD WHERE SA<20