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SELECT XM,SA,SD FROM STUD
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WHERE SA NOT BETWEEN 20 AND 23; SELECT XM,SA,SD FROM STUD
WHERE SA BETWEEN 20 AND 23
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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
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
SELECT XM, SA, SD FROM STUD WHERE BETWEEN 20<SA<23; SELECT XM, SA, SD FROM STUD WHERE SA BETWEEN 23 AND 20; SELECT XM, SA, SD FROM STUD WHERE SA NOT BETWEEN 20 AND 23; SELECT XM, SA, SD FROM STUD WHERE SA BETWEEN 20 AND 23;
。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