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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
      • SQL Server 2008教程之SQL AVG 函數

      • 2015-01-16 04:06 來源:未知
      SQL AVG 函數

      (相關sql教程 及sql server 2008 教程

      定義和用法
      AVG 函數返回數值列的平均值。NULL 值不包括在計算中。
      SQL AVG() 語法
      SELECT AVG(column_name) FROM table_name
      SQL AVG() 實例
      我們擁有下面這個 "Orders" 表:
      O_Id OrderDate OrderPrice Customer
      1 2008/12/29 1000 Bush
      2 2008/11/23 1600 Carter
      3 2008/10/05 700 Bush
      4 2008/09/28 300 Bush
      5 2008/08/06 2000 Adams
      6 2008/07/21 100 Carter
      例子 1
      現在,我們希望計算 "OrderPrice" 字段的平均值。
      我們使用如下 SQL 語句:
      SELECT AVG(OrderPrice) AS OrderAverage FROM Orders
      結果集類似這樣:
      OrderAverage
      950
      例子 2
      現在,我們希望找到 OrderPrice 值高于 OrderPrice 平均值的客戶。
      我們使用如下 SQL 語句:
      SELECT Customer FROM Orders
      WHERE OrderPrice>(SELECT AVG(OrderPrice) FROM Orders)
      結果集類似這樣:
      Customer
      Bush
      Carter
      Adams
       
       
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