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      • sql語句大全之根據表中數據更新行

      • 2015-01-25 00:21 來源:未知

      根據表中數據更新行sql語句大全

      在分析了UPDATE語句的各個部分之后,現在把它們匯總起來應用到一些實例當中,這些實例都基于商品信息表。
      例如,將商品信息表中的商品信息編號為A10001的庫存量減1,可以使用如下更新語句,但庫存量的數據類型必須是數值型。
      update 商品信息
      set 庫存量=庫存量-1
      where 商品編號='A10001'
      select * from 商品信息
      go
      在更新數據后,執行SELECT語句查看可以結果,執行上述語句后,可以看到輸出結果如圖6-8所示。

      圖6-8  更改單行數據
      在需要更新整列數據時,這時也可以使用UPDATE語句,例如需要將所有的商品價格上調5元。可以執行如下UPDATE語句:
      update 商品信息
      set 商品價格=商品價格+5
      select * from 商品信息
      go
      執行上述語句后,輸出結果如圖6-9所示,與圖6-8所示比較,商品價格都增加了5元。

      圖6-9  改變整列數據
      在SET子句中還可以指定多個表達式,也就是說,一次可以改變一個以上的列的值。例如,需要將商品為A10001的商品價格由原來的26元提高為30元,同時將其庫存量加5可以使用如下UPDATE語句。
      update 商品信息
      set 商品價格=30,庫存量=庫存量+5
      where 商品編號='A10001'
      select * from 商品信息
      go
      執行上面UPDATE語句后,顯示結果如圖6-10所示。

      圖6-10  實現多列同時更新
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