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
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1.單項選擇題在SQL Server2008數(shù)據(jù)庫中,可以使用()關鍵字來限制返回的數(shù)據(jù)行數(shù)。
A.LIMIT
B.TOP
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2.單項選擇題一個電視經(jīng)銷商在表Tvtype中維護庫存的電視信息,下述()語句能顯示價格(iprice)最昂貴的三種電視機的信息(cDiscription)
A.select top3 cDiscription fromTvtype order by iprice asc
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