單項選擇題在SQLServer數(shù)據庫中,HAVING和WHERE子句以及GROUPBY可以在同一SELECT語句中使用,其正確的先后順序為()
A.GROUP BY WHERE HAVING
B.WHE REGROUP BY HAVING
C.WHE REHAVING GROUP BY
D.HAVING WHERE GROUP BY
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1.單項選擇題查詢student表中的所有非空email信息,以下語句正確的是()
A.Select email from student where email!=null
B.Select email from student where emailnotisnull
C.Select email from student where email<>null
D.Select email from student where emailisnotnull
2.單項選擇題在SQL Server2008數(shù)據庫中,可以使用()關鍵字來限制返回的數(shù)據行數(shù)。
A.LIMIT
B.TOP
C.COUNT
D.SUM