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已知有关系“STUDENT”,则关系运算σANE<80(STUDENT)用SQL语句表示为(52)。A.SELECT(* )FROM STUDEN
已知有关系“STUDENT”,则关系运算σANE<80(STUDENT)用SQL语句表示为(52)。
A.SELECT(* )FROM STUDENT WHERE AVE < 80
B.SELECT(* )FROM STUDENT HAVING AVE < 80
C.SELECT(AVE)FROM STUDENT WHERE AVE < 80
D.SELECT(AVE) FROM STUDENT HAVING AVE < 80