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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
      SQL Server 2008 視頻教程 c#入門經典教程 Visual Basic從門到精通視頻教程
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      • sql語句大全之使用top表達式

      • 2015-01-25 00:38 來源:未知

      使用top表達式sql語句大全

      除了常用的UPDATE語句外,還可以使用TOP子句來限制UPDATE語句中修改的行數。當在UPDATE語句中使用TOP (n)子句時,將基于隨機選擇n行來執行更新操作。
      例如,某家商場搞活動,需要隨機抽5件商品價格降低25%,即商品信息表中的隨機5件商品價格降低25%,可以使用如下的UPDATE語句。
      UPDATE TOP (5) 商品信息
      SET 商品價格 = 商品價格*0.75
      GO
      select * from 商品信息
      go
      更改前的商品信息表的商品價格如圖6-13所示。執行上述UPDATE語句后,執行結果如圖6-14所示。

      圖6-13  更改前的商品信息表

      圖6-14  更改后的商品信息表
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