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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SQL Server 分頁編號的另一種方式

      • 2019-04-29 22:50 來源:未知

      今天看書講T-SQL,看到了UNBOUNDED PRECEDING,就想比對下ROW_NUMBER()的運行速度。

      sql及相關的結果如下,數據庫中的數據有5W+。

      ROW_NUMBER():

      復制代碼
      SET STATISTICS TIME ON
      
      SELECT
          ROW_NUMBER() OVER(ORDER BY Id DESC) rn,Id
      FROM
          dbo.T_MyCourse
      復制代碼

      運行結果

      UNBOUNDED PRECEDING

      復制代碼
      SET STATISTICS TIME ON
      
      SELECT
          SUM(1) OVER(ORDER BY Id DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) rn,Id
      FROM
          dbo.T_MyCourse
      復制代碼

      運行結果

      通過運行之后,看到結果,使用微軟官方提供的方法進行編號排序,速度明顯的提高。

      不過我使用上述方法進行分頁獲取數據的時候結果又有點不一樣。

      分頁獲取數據:

      ROW_NUMBER() 分頁獲取數據:

      復制代碼
      SET STATISTICS TIME ON
      
      SELECT
          *
      FROM
          (
          SELECT
              ROW_NUMBER() OVER(ORDER BY Id DESC) rn,Id
          FROM
              dbo.T_MyCourse
          )a
      WHERE
          a.rn BETWEEN 55 AND 444
      復制代碼

       

       執行sql命令:DBCC DROPCLEANBUFFERS ,清除數據庫緩存后的結果

       

      UNBOUNDED分頁獲取數據:

      復制代碼
      SET STATISTICS TIME ON
      
      SELECT
          *
      FROM
          (
          SELECT
              SUM(1) OVER(ORDER BY Id DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) rn,Id
          FROM
              dbo.T_MyCourse
          )a
      WHERE
          a.rn BETWEEN 22 AND 444
      復制代碼

       UNBOUNDED這個方式下執行了DBCC DROPCLEANBUFFERS 清除緩存的sql也沒有用,執行時間沒有變化。

       通過上述結果,看到ROW_NUMBER()獲取分頁的數據明顯更快,我猜測是微軟對ROW_NUMBER()這個方法做了優化,可能是有緩存,讀取的緩存中的數據然后進行分頁。

      如果有知道的網友,請評論告訴我,讓我學習學習。

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