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【单选题】
由于聚合函数不能出现在WHERE子句中,所以SQL中增加 ( )子句来起到测试查询结果是否符合聚合函数有关的条件。A.
H AVING
B.
S ELECT
C.
W HERE
D.
W HILE
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【简答题】英译中:The answer to the question "What needs to be done?“ almost always contains more than one urgent task. But effective executives do not splinter themselves.
【简答题】根据控制时间的不同可将管理控制划分为( )、( )和( )三类。
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【简答题】Translate: The answer to the queston“What needs to be done?" almost always contains more than one urgent task. But effective executives do not splinter themselves.
【简答题】两级放大电路由两个具有相同频率特性的单管放大电路组成,下限频率f=100Hz,则总下限频率为( )Hz
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