SQLServer中怎么改写内联表值函数-创新互联-成都创新互联网站建设

成都创新互联网站制作

028-86922220

关于创新互联

多方位宣传企业产品与服务 突出企业形象

公司简介 公司的服务 荣誉资质 新闻动态 联系我们

SQLServer中怎么改写内联表值函数-创新互联

这篇文章主要讲解了“SQL Server中怎么改写内联表值函数”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“SQL Server中怎么改写内联表值函数”吧！

公司主营业务：网站制作、成都做网站、移动网站开发等业务。帮助企业客户真正实现互联网宣传，提高企业的竞争能力。成都创新互联是一支青春激扬、勤奋敬业、活力青春激扬、勤奋敬业、活力澎湃、和谐高效的团队。公司秉承以“开放、自由、严谨、自律”为核心的企业文化，感谢他们对我们的高要求，感谢他们从不同领域给我们带来的挑战，让我们激情的团队有机会用头脑与智慧不断的给客户带来惊喜。成都创新互联推出洞头免费做网站回馈大家。

问题SQL：

SELECT TOP 1001 ha.HuntApplicationID ,
           ha.PartyNumber ,
           mht.Name AS MasterHuntTypeName ,
           htly.LicenseYear ,
           lStatus.[Status] AS DrawTicketStatus ,
           isnull(dbo.udf_GetHuntApplicationPartyCount(ha.HuntApplicationID), 0) AS MemberCount ,
           count( won.DrawTicketLicenseID) AS DrawnMemberCount ,
           won.drawticketid ,
           dt.PreDrawNonResidentMemberCount AS NRMemberCount ,
           dbo.udf_GetAvgPreferencePoints(dt.DrawTicketID) AS PreferencePointAverage ,
           CASE
               WHEN ha.Quantity > 1 THEN NULL
               ELSE dt.PreDrawRandomNumber
           END AS PreDrawRandomNumber ,
           dsm.Name AS DrawSelectionMethodName ,
           dt.DrawnSequence ,
           dt.PreferencePointRank ,
           dt.DrawID ,
           dt.RandomRank
FROM dbo.HuntApplication ha
JOIN dbo.HuntTypeLicenseYear htly ON ha.HuntTypeLicenseYearID = htly.HuntTypeLicenseYearID
JOIN dbo.MasterHuntType mht ON htly.MasterHuntTypeID = mht.MasterHuntTypeID
LEFT JOIN dbo.HuntApplicationLicense hal ON ha.HuntApplicationID = hal.HuntApplicationID
LEFT JOIN dbo.DrawTicket dt ON ha.HuntApplicationID = dt.HuntApplicationID
LEFT JOIN dbo.DrawTicketLicense won ON dt.DrawTicketID = won.DrawTicketID
AND won.WasDrawn = 1
LEFT JOIN dbo.DrawSelectionMethod dsm ON dt.DrawSelectionMethodID = dsm.DrawSelectionMethodID
LEFT JOIN dbo.StatusCode lStatus ON dt.StatusCodeID = lStatus.StatusCodeID
JOIN dbo.DrawTicketHuntChoice dthc ON dt.DrawTicketID = dthc.DrawTicketID
CROSS APPLY dbo.tvf_GetHuntApplicationPartyCount(ha.HuntApplicationID) hapc
CROSS APPLY dbo.tvf_GetAvgPreferencePoints(dt.DrawTicketID) app
WHERE 1 = 1
  AND htly.MasterHuntTypeID = @iMasterHuntTypeID
  AND htly.LicenseYear = @iLicenseYear
  AND dt.StatusCodeID = @iDrawTicketStatusCodeID
  AND dthc.WasDrawn = @iHuntChoiceWasDrawn
GROUP BY ha.HuntApplicationID,
         ha.PartyNumber,
         mht.[Name],
         htly.LicenseYear,
         lStatus.[Status],
         isnull(dbo.udf_GetHuntApplicationPartyCount(ha.HuntApplicationID), 0),
         won.DrawTicketID,
         dt.PreDrawNonResidentMemberCount,
         dbo.udf_GetAvgPreferencePoints(dt.DrawTicketID),
         CASE
             WHEN ha.Quantity > 1 THEN NULL
             ELSE dt.PreDrawRandomNumber
         END,
         dsm.[Name],
         dt.DrawnSequence,
         dt.PreferencePointRank,
         dt.DrawID,
         dt.RandomRank
ORDER BY htly.LicenseYear DESC,
         mht.Name,
         lStatus.[Status],
         dt.DrawID,
         PreferencePointAverage DESC,
         PreDrawRandomNumber,
         ha.PartyNumber

静态函数：

CREATE FUNCTION [dbo].[udf_GetAvgPreferencePoints]
(@DrawTicketID INT)
RETURNS NUMERIC (18, 3)
AS
BEGIN
    RETURN
	(
		SELECT TOP 1
				CONVERT(DECIMAL, dt.PreDrawPreferencePointTotal) / NULLIF(CONVERT(DECIMAL, dt.PreDrawMemberCount),0)
		FROM dbo.DrawTicket dt
			WHERE dt.DrawTicketID = @DrawTicketID
	)
END

执行时间40s

这是典型可以进行静态函数改写内联表值函数的sql：

改写后：

SELECT TOP 1001 ha.HuntApplicationID ,
           ha.PartyNumber ,
           mht.Name AS MasterHuntTypeName ,
           htly.LicenseYear ,
           lStatus.[Status] AS DrawTicketStatus ,
           --isnull(dbo.udf_GetHuntApplicationPartyCount(ha.HuntApplicationID), 0) AS MemberCount ,
		   isnull(hapc.MemberCount, 0) AS MemberCount,
           count( won.DrawTicketLicenseID) AS DrawnMemberCount ,
           won.drawticketid ,
           dt.PreDrawNonResidentMemberCount AS NRMemberCount ,
           --dbo.udf_GetAvgPreferencePoints(dt.DrawTicketID) AS PreferencePointAverage ,
		   app.PreferencePointAverage PreferencePointAverage,
           CASE
               WHEN ha.Quantity > 1 THEN NULL
               ELSE dt.PreDrawRandomNumber
           END AS PreDrawRandomNumber ,
           dsm.Name AS DrawSelectionMethodName ,
           dt.DrawnSequence ,
           dt.PreferencePointRank ,
           dt.DrawID ,
           dt.RandomRank
FROM dbo.HuntApplication ha
JOIN dbo.HuntTypeLicenseYear htly ON ha.HuntTypeLicenseYearID = htly.HuntTypeLicenseYearID
JOIN dbo.MasterHuntType mht ON htly.MasterHuntTypeID = mht.MasterHuntTypeID
LEFT JOIN dbo.HuntApplicationLicense hal ON ha.HuntApplicationID = hal.HuntApplicationID
LEFT JOIN dbo.DrawTicket dt ON ha.HuntApplicationID = dt.HuntApplicationID
LEFT JOIN dbo.DrawTicketLicense won ON dt.DrawTicketID = won.DrawTicketID
AND won.WasDrawn = 1
LEFT JOIN dbo.DrawSelectionMethod dsm ON dt.DrawSelectionMethodID = dsm.DrawSelectionMethodID
LEFT JOIN dbo.StatusCode lStatus ON dt.StatusCodeID = lStatus.StatusCodeID
JOIN dbo.DrawTicketHuntChoice dthc ON dt.DrawTicketID = dthc.DrawTicketID
CROSS APPLY dbo.tvf_GetHuntApplicationPartyCount(ha.HuntApplicationID) hapc
CROSS APPLY dbo.tvf_GetAvgPreferencePoints(dt.DrawTicketID) app
WHERE 1 = 1
  AND htly.MasterHuntTypeID = @iMasterHuntTypeID
  AND htly.LicenseYear = @iLicenseYear
  AND dt.StatusCodeID = @iDrawTicketStatusCodeID
  AND dthc.WasDrawn = @iHuntChoiceWasDrawn
GROUP BY ha.HuntApplicationID,
         ha.PartyNumber,
         mht.[Name],
         htly.LicenseYear,
         lStatus.[Status],
         --isnull(dbo.udf_GetHuntApplicationPartyCount(ha.HuntApplicationID), 0),
		 isnull(hapc.MemberCount, 0),
         won.DrawTicketID,
         dt.PreDrawNonResidentMemberCount,
         --dbo.udf_GetAvgPreferencePoints(dt.DrawTicketID),
		 app.PreferencePointAverage,
         CASE
             WHEN ha.Quantity > 1 THEN NULL
             ELSE dt.PreDrawRandomNumber
         END,
         dsm.[Name],
         dt.DrawnSequence,
         dt.PreferencePointRank,
         dt.DrawID,
         dt.RandomRank
ORDER BY htly.LicenseYear DESC,
         mht.Name,
         lStatus.[Status],
         dt.DrawID,
         PreferencePointAverage DESC,
         PreDrawRandomNumber,
         ha.PartyNumber

对应的表值函数：

CREATE FUNCTION [dbo].[tvf_GetAvgPreferencePoints]
(@DrawTicketID INT)
RETURNS TABLE WITH SCHEMABINDING
AS
RETURN
(
	SELECT TOP 1
			CONVERT(DECIMAL, dt.PreDrawPreferencePointTotal) / NULLIF(CONVERT(DECIMAL, dt.PreDrawMemberCount),0) as PreferencePointAverage
	FROM dbo.DrawTicket dt
		WHERE dt.DrawTicketID = @DrawTicketID
)
GO

改写后执行时间从40s降低到16s，对于倾斜列的优化速度更为明显

感谢各位的阅读，以上就是“SQL Server中怎么改写内联表值函数”的内容了，经过本文的学习后，相信大家对SQL Server中怎么改写内联表值函数这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！


文章名称：SQLServer中怎么改写内联表值函数-创新互联
网页地址：http://kswsj.cn/article/digode.html

其他资讯