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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 COUNT() 函數

      • 2015-01-16 04:06 來源:未知
      SQL COUNT() 函數

      (相關sql教程 及sql server 2008 教程

      COUNT() 函數返回匹配指定條件的行數。
      SQL COUNT() 語法
      SQL COUNT(column_name) 語法
      COUNT(column_name) 函數返回指定列的值的數目(NULL 不計入):
      SELECT COUNT(column_name) FROM table_name
      SQL COUNT(*) 語法
      COUNT(*) 函數返回表中的記錄數:
      SELECT COUNT(*) FROM table_name
      SQL COUNT(DISTINCT column_name) 語法
      COUNT(DISTINCT column_name) 函數返回指定列的不同值的數目:
      SELECT COUNT(DISTINCT column_name) FROM table_name
      注釋:COUNT(DISTINCT) 適用于 ORACLE 和 Microsoft SQL Server,但是無法用于 Microsoft Access。
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