SQL Server分页查询方法整理
SQL Server數據庫分頁查詢一直是SQL Server的短板,閑來無事,想出幾種方法,假設有表ARTICLE,字段ID、YEAR...(其他省略),數據53210條(客戶真實數據,量不大),分頁查詢每頁30條,查詢第1500頁(即第45001-45030條數據),字段ID聚集索引,YEAR無索引,SQL Server版本:SQL Server?2008R2
第一種方案、最簡單、普通的方法:
SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 45000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC???? 平均查詢100次所需時間:45s
第二種方案:
SELECT * FROM(
SELECT TOP 30 * FROM (SELECT TOP 45030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC
) s ORDER BY s.YEAR DESC,s.ID DESC
???? 平均查詢100次所需時間:138S
第三種方案:
SELECT * FROM ARTICLE w1, (SELECT TOP 30 ID FROM (SELECT TOP 50030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC) w ORDER BY w.YEAR ASC, w.ID ASC ) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC???? 平均查詢100次所需時間:21S
第四種方案:
SELECT * FROM ARTICLE w1 WHERE ID in (SELECT top 30 ID FROM (SELECT top 45030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC) w ORDER BY w.YEAR ASC, w.ID ASC) ORDER BY w1.YEAR DESC, w1.ID DESC???? 平均查詢100次所需時間:20S
第五種方案:
SELECT w2.n, w1.* FROM ARTICLE w1,(
SELECT TOP 50030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE
) w2 WHERE w1.ID = w2.ID AND w2.n > 50000 ORDER BY w2.n ASC
???? 平均查詢100次所需時間:15S
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查詢第1000-1030條記錄
第一種方案:
SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 1000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC???? 平均查詢100次所需時間:80s
第二種方案:
SELECT * FROM(
SELECT TOP 30 * FROM (SELECT TOP 1030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC
) s ORDER BY s.YEAR DESC,s.ID DESC
???? 平均查詢100次所需時間:30S
第三種方案:
SELECT * FROM ARTICLE w1, (SELECT TOP 30 ID FROM (SELECT TOP 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC) w ORDER BY w.YEAR ASC, w.ID ASC ) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC???? 平均查詢100次所需時間:12S
第四種方案:
SELECT * FROM ARTICLE w1 WHERE ID in (SELECT top 30 ID FROM (SELECT top 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC) w ORDER BY w.YEAR ASC, w.ID ASC) ORDER BY w1.YEAR DESC, w1.ID DESC???? 平均查詢100次所需時間:13S
第五種方案:
SELECT w2.n, w1.* FROM ARTICLE w1,(
SELECT TOP 1030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE
) w2 WHERE w1.ID = w2.ID AND w2.n > 1000 ORDER BY w2.n ASC
???? 平均查詢100次所需時間:14S
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???? 由此可見在查詢頁數靠前時,效率3>4>5>2>1,頁碼靠后時5>4>3>1>2,再根據用戶習慣,一般用戶的檢索只看最前面幾頁,因此選擇3 4 5方案均可,若綜合考慮方案5是最好的選擇,但是要注意SQL2000不支持row_number()函數,由于時間和條件的限制沒有做更深入、范圍更廣的測試,有興趣的可以仔細研究下。
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以下是根據第四種方案編寫的一個分頁存儲過程:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sys_Page_v2]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) drop procedure [dbo].[sys_Page_v2] GOCREATE PROCEDURE [dbo].[sys_Page_v2] @PCount int output, --總頁數輸出 @RCount int output, --總記錄數輸出 @sys_Table nvarchar(100), --查詢表名 @sys_Key varchar(50), --主鍵 @sys_Fields nvarchar(500), --查詢字段 @sys_Where nvarchar(3000), --查詢條件 @sys_Order nvarchar(100), --排序字段 @sys_Begin int, --開始位置 @sys_PageIndex int, --當前頁數 @sys_PageSize int --頁大小 ASSET NOCOUNT ON SET ANSI_WARNINGS ONIF @sys_PageSize < 0 OR @sys_PageIndex < 0 BEGIN RETURN ENDDECLARE @new_where1 NVARCHAR(3000) DECLARE @new_order1 NVARCHAR(100) DECLARE @new_order2 NVARCHAR(100) DECLARE @Sql NVARCHAR(4000) DECLARE @SqlCount NVARCHAR(4000)DECLARE @Top intif(@sys_Begin <=0)set @sys_Begin=0 elseset @sys_Begin=@sys_Begin-1IF ISNULL(@sys_Where,'') = ''SET @new_where1 = ' ' ELSESET @new_where1 = ' WHERE ' + @sys_Where IF ISNULL(@sys_Order,'') <> '' BEGINSET @new_order1 = ' ORDER BY ' + Replace(@sys_Order,'desc','')SET @new_order1 = Replace(@new_order1,'asc','desc')SET @new_order2 = ' ORDER BY ' + @sys_Order END ELSE BEGINSET @new_order1 = ' ORDER BY ID DESC'SET @new_order2 = ' ORDER BY ID ASC' ENDSET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/'+ CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where1EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT',@RCount OUTPUT,@PCount OUTPUTIF @sys_PageIndex > CEILING((@RCount+0.0)/@sys_PageSize) --如果輸入的當前頁數大于實際總頁數,則把實際總頁數賦值給當前頁數 BEGINSET @sys_PageIndex = CEILING((@RCount+0.0)/@sys_PageSize) ENDset @sql = 'select '+ @sys_fields +' from ' + @sys_Table + ' w1 '+ ' where '+ @sys_Key +' in ('+'select top '+ ltrim(str(@sys_PageSize)) +' ' + @sys_Key + ' from '+'('+'select top ' + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) + ' ' + @sys_Key + ' FROM ' + @sys_Table + @new_where1 + @new_order2 +') w ' + @new_order1+') ' + @new_order2print(@sql)Exec(@sql)GO 以上均轉自http://www.cnblogs.com/ddlink/archive/2013/03/30/2991007.html。方便學習和回顧。轉載于:https://www.cnblogs.com/hlgBLOG/p/7125210.html
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