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摘要： 注：并非所有的数据库系统都支持 TOP 子句。Persons 表:IdLastNameFirstNameAddressCity1AdamsJohnOxford StreetLondon2BushGeorgeFifth AvenueNew York3CarterThomasChangan StreetBeijing4ObamaBarackPennsylvania AvenueWashingtonSQL Server 语法：SELECT TOP number|percent 列 FROM 表例：如果我们希望从上面的表中选取头两条记录。语句如下：SELECT TOP 2 * FROM Persons 阅读全文