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在学生表中要查找所有年龄小于20岁且姓王的男生,应采用的关系运算是( )。

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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  
LIST姓名FOR出生日期=1985  LIST姓名FOR出生日期=’1985’  LIST姓名FORYEAR(出生日期)=1985  LIST姓名FORYEAR(’出生日期’)=1985  
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  

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