假设表s中有10条记录,其中字段b小于20的记录有3条,大于等于20、并且小于等于30的记录有3条,大于30的记录有4条。执行下面的程序后,屏幕显示的结构是( )。 SETDELETE ONDELETEFROM s WHERE b BETWEEN 20 AND 307RECCOUNT() A.10 B.7 C.0 D.3
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答案解析:
Directions: Read the texts that follow. Each text is followed by several questio
Directions: Read the texts that follow. Each text is followed by several questions. Select the best