SQL Server - 包含 TOP 1 选择列的视图答案

【问题标题】：SQL Server - View that contains a TOP 1 select columnSQL Server - 包含 TOP 1 选择列的视图
【发布时间】：2019-11-27 19:05:48
【问题描述】：

我有一个客户表，然后有一个单独的事务表交叉引用客户表。使用一个特定的列，我想将其作为组合 SQL 视图呈现给消费者。此事务列称为LastEdited。

如果我通过查询 FirstName、LastName 等列来运行 SELECT 语句，则视图本身很好。我遇到问题的地方是查询 LastEdited 列时。此列使用 TOP 1 选择标准。例如，如果我查询 LastEdited BETWEEN '1/1/2019 00:00:01' 和 '6/30/2019 23:59:59'。结果需要很长时间，因为存在明显的性能损失。

关于如何最好地处理这个问题有什么建议吗？我尝试通过调用标量函数为该视图创建列，例如：

(选择 dbo.fncUser_LastCustomerEditDate(c.CustomerNo)) 作为 LastEdited

这个标量函数基本上返回 TOP 1 记录。我还尝试通过针对 OUTER APPLY 引用它来创建列，例如：

...外部应用（从 dbo.tbl121_DataLog dl 中选择前 1 个 GMTTimestamp，其中 dl.PrimaryKey = c.Id 和 dl.DBActionId In (600001, 600002) order by dl.GMTTimeStamp DESC）dl

所以我的 SELECT 列表只看：

dl.GMTTimeStamp as LastEdited

这两个选项都没有让我能够通过查询基于此列的结果视图来快速返回结果。

任何帮助或建议将不胜感激！

这是我目前尝试过的两种视图结构：

CREATE VIEW [dbo].[viwUser_Customers_Custom2]
AS
SELECT     c.Id, c.Type, c.CustomerNo, sit.Code AS PrimarySiteCode, sit.Name AS PrimarySiteName, emp.Code AS PrimarySalespersonCode, 
                      emp.Name AS PrimarySalespersonName, c.Title, c.FirstName, c.MiddleName, c.LastName, c.NickName, c.Greeting, c.PreviousName, 
                      dbo.fncCustContactMethodText(c.PreferredContactMethod) AS PreferredContactMethod, cad.Address1, cad.Address2, cad.Address3, cad.City, cad.State, 
                      cad.PostCode, cad.Country, cpp.CountryPrefix AS PhoneCountryPrefix, cpp.AreaCode AS PhoneAreaCode, cpp.Number AS PhoneNumber, 
                      cpp.Extension AS PhoneExtension, dbo.fncCustFormattedPhoneNo(cpp.CountryPrefix, cpp.AreaCode, cpp.Number, cpp.Extension) 
                      AS PhoneNumberFormatted, cpf.CountryPrefix AS FaxCountryPrefix, cpf.AreaCode AS FaxAreaCode, cpf.Number AS FaxNumber, 
                      cpf.Extension AS FaxExtension, dbo.fncCustFormattedPhoneNo(cpf.CountryPrefix, cpf.AreaCode, cpf.Number, cpf.Extension) AS FaxNumberFormatted, 
                      cpm.CountryPrefix AS MobileCountryPrefix, cpm.AreaCode AS MobileAreaCode, cpm.Number AS MobileNumber, cpm.Extension AS MobileExtension, 
                      dbo.fncCustFormattedPhoneNo(cpm.CountryPrefix, cpm.AreaCode, cpm.Number, cpm.Extension) AS MobileNumberFormatted, cpe.EmailAddress, c.Sex, 
                      c.UDFList1, c.UDFList2, c.UDFList3, c.UDFList4, c.UDFList5, c.UDFList6, c.UDFList7, c.UDFList8, c.UDFList9, c.UDFList10, c.UDFList11, c.UDFList12, 
                      c.FingerSize1 AS LeftLittleFingerSize, c.FingerSize2 AS LeftRingFingerSize, c.FingerSize3 AS LeftMiddleFingerSize, 
                      c.FingerSize4 AS LeftIndexFingerSize, c.FingerSize5 AS LeftThumbSize, c.FingerSize6 AS RightThumbSize, c.FingerSize7 AS RightIndexFingerSize, 
                      c.FingerSize8 AS RightMiddleFingerSize, c.FingerSize9 AS RightRingFingerSize, c.FingerSize10 AS RightLittleFingerSize, c.LeftWristSize, 
                      c.RightWristSize, c.NeckSize, c.SocSecNumber, c.POSComments, c.SecureComments, c.Status, c.Active, c.Day, c.Month, c.Year, dbo.fncGetDOB(c.Day, 
                      c.Month, c.Year) AS BirthDate, dbo.fncGetAge(c.Day, c.Month, c.Year, c.Age, c.AgeReferenceDate, GETDATE()) AS Age, CAST('' AS varchar(1000)) 
                      AS MailingName, CAST('' AS varchar(1000)) AS GreetingName, CAST(0 AS money) AS CustomerSalesTotalForDateRange, CAST(0 AS money) 
                      AS CustomerSalesTotal, CAST('' AS varchar(50)) AS PartnerCustomerNo, CAST('' AS varchar(20)) AS PartnerBirthDate, CAST(0 AS money) 
                      AS PartnerSalesTotalForDateRange, CAST(0 AS money) AS PartnerSalesTotal, dbo.fnc604S_GetAnniversary(c.Id) as Anniversary,
        Coalesce((Select Top 1 cd.DiscountPercent From tbl605_CustDiscount cd Where cd.CustomerId = c.Id),0) as DiscountPercent, 
            dl.GMTTimeStamp as LastEdited
FROM         dbo.tbl600_Customer AS c INNER JOIN
                      dbo.tbl103_Sites AS sit ON c.SiteId = sit.Id LEFT OUTER JOIN
                      dbo.tbl601_CustAddress AS cad ON cad.CustomerId = c.Id AND cad.[Default] = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpp ON cpp.CustomerId = c.Id AND cpp.Device = 1 AND cpp.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpf ON cpf.CustomerId = c.Id AND cpf.Device = 3 AND cpf.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpm ON cpm.CustomerId = c.Id AND cpm.Device = 2 AND cpm.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpe ON cpe.CustomerId = c.Id AND cpe.Device = 4 AND cpe.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl405_Employees AS emp ON dbo.fnc600S_GetPrimarySalespersonId(c.Id) = emp.Id OUTER APPLY
                      (SELECT top 1 GMTTimestamp from dbo.tbl121_DataLog dl where dl.PrimaryKey = c.Id and dl.DBActionId In (600001, 600002) order by dl.GMTTimeStamp DESC) dl



GO





CREATE VIEW [dbo].[viwUser_Customers_Custom]
AS
SELECT     c.Id, c.Type, c.CustomerNo, sit.Code AS PrimarySiteCode, sit.Name AS PrimarySiteName, emp.Code AS PrimarySalespersonCode, 
                      emp.Name AS PrimarySalespersonName, c.Title, c.FirstName, c.MiddleName, c.LastName, c.NickName, c.Greeting, c.PreviousName, 
                      dbo.fncCustContactMethodText(c.PreferredContactMethod) AS PreferredContactMethod, cad.Address1, cad.Address2, cad.Address3, cad.City, cad.State, 
                      cad.PostCode, cad.Country, cpp.CountryPrefix AS PhoneCountryPrefix, cpp.AreaCode AS PhoneAreaCode, cpp.Number AS PhoneNumber, 
                      cpp.Extension AS PhoneExtension, dbo.fncCustFormattedPhoneNo(cpp.CountryPrefix, cpp.AreaCode, cpp.Number, cpp.Extension) 
                      AS PhoneNumberFormatted, cpf.CountryPrefix AS FaxCountryPrefix, cpf.AreaCode AS FaxAreaCode, cpf.Number AS FaxNumber, 
                      cpf.Extension AS FaxExtension, dbo.fncCustFormattedPhoneNo(cpf.CountryPrefix, cpf.AreaCode, cpf.Number, cpf.Extension) AS FaxNumberFormatted, 
                      cpm.CountryPrefix AS MobileCountryPrefix, cpm.AreaCode AS MobileAreaCode, cpm.Number AS MobileNumber, cpm.Extension AS MobileExtension, 
                      dbo.fncCustFormattedPhoneNo(cpm.CountryPrefix, cpm.AreaCode, cpm.Number, cpm.Extension) AS MobileNumberFormatted, cpe.EmailAddress, c.Sex, 
                      c.UDFList1, c.UDFList2, c.UDFList3, c.UDFList4, c.UDFList5, c.UDFList6, c.UDFList7, c.UDFList8, c.UDFList9, c.UDFList10, c.UDFList11, c.UDFList12, 
                      c.FingerSize1 AS LeftLittleFingerSize, c.FingerSize2 AS LeftRingFingerSize, c.FingerSize3 AS LeftMiddleFingerSize, 
                      c.FingerSize4 AS LeftIndexFingerSize, c.FingerSize5 AS LeftThumbSize, c.FingerSize6 AS RightThumbSize, c.FingerSize7 AS RightIndexFingerSize, 
                      c.FingerSize8 AS RightMiddleFingerSize, c.FingerSize9 AS RightRingFingerSize, c.FingerSize10 AS RightLittleFingerSize, c.LeftWristSize, 
                      c.RightWristSize, c.NeckSize, c.SocSecNumber, c.POSComments, c.SecureComments, c.Status, c.Active, c.Day, c.Month, c.Year, dbo.fncGetDOB(c.Day, 
                      c.Month, c.Year) AS BirthDate, dbo.fncGetAge(c.Day, c.Month, c.Year, c.Age, c.AgeReferenceDate, GETDATE()) AS Age, CAST('' AS varchar(1000)) 
                      AS MailingName, CAST('' AS varchar(1000)) AS GreetingName, CAST(0 AS money) AS CustomerSalesTotalForDateRange, CAST(0 AS money) 
                      AS CustomerSalesTotal, CAST('' AS varchar(50)) AS PartnerCustomerNo, CAST('' AS varchar(20)) AS PartnerBirthDate, CAST(0 AS money) 
                      AS PartnerSalesTotalForDateRange, CAST(0 AS money) AS PartnerSalesTotal, dbo.fnc604S_GetAnniversary(c.Id) as Anniversary,
        Coalesce((Select Top 1 cd.DiscountPercent From tbl605_CustDiscount cd Where cd.CustomerId = c.Id),0) as DiscountPercent, (select dbo.fncUser_LastCustomerEditDate(c.CustomerNo)) as LastEdited
FROM         dbo.tbl600_Customer AS c INNER JOIN
                      dbo.tbl103_Sites AS sit ON c.SiteId = sit.Id LEFT OUTER JOIN
                      dbo.tbl601_CustAddress AS cad ON cad.CustomerId = c.Id AND cad.[Default] = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpp ON cpp.CustomerId = c.Id AND cpp.Device = 1 AND cpp.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpf ON cpf.CustomerId = c.Id AND cpf.Device = 3 AND cpf.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpm ON cpm.CustomerId = c.Id AND cpm.Device = 2 AND cpm.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl602_CustPhone AS cpe ON cpe.CustomerId = c.Id AND cpe.Device = 4 AND cpe.DeviceDefault = 1 LEFT OUTER JOIN
                      dbo.tbl405_Employees AS emp ON dbo.fnc600S_GetPrimarySalespersonId(c.Id) = emp.Id

GO

查询 SQL 视图的时间延迟为 1-2 分钟。

【问题讨论】：

标签： sql-server view

【解决方案1】：

我找到了一种更简单的方法来实现这一点。将只添加一个 SQL 触发器以将带时间戳的行插入到补充表中。该表将具有适当的结构，以便更快地查找。

【讨论】：