基于日期SQL删除旧记录

这是我的问题

SELECT 
    cf.CLIENTID, p.Id as ProfileID, t.TITLEDESC as Title,
    cf.ClntForenme as Name, cf.CLNTSURNME as Surname, 
    pm.Lender, pm.Product, pm.LenderReference,
    pm.AmountRequested as LoanAmount,
    pm.DateCompleted, 
    CASE 
       WHEN pm.DateCompleted BETWEEN (SELECT DATEADD(YEAR, -1, GETDATE())) AND GETDATE() 
          THEN 'Completed under a year ago'
       WHEN pm.DateCompleted BETWEEN (SELECT DATEADD(YEAR, -2, GETDATE())) AND (SELECT DATEADD(YEAR, -1, GETDATE())) 
          THEN 'Backlog WOM 1 Year'
       WHEN pm.DateCompleted BETWEEN (SELECT DATEADD(YEAR, -3, GETDATE())) AND (SELECT DATEADD(YEAR, -2, GETDATE())) 
          THEN 'Backlog WOM 2 Year'
       WHEN pm.DateCompleted BETWEEN (SELECT DATEADD(YEAR, -4, GETDATE())) AND (SELECT DATEADD(YEAR, -3, GETDATE())) 
          THEN 'Backlog WOM 3 Year'
       ELSE ''
    END Source,
    CASE 
       WHEN pm.Id > 0 THEN 'Check Perspectiove for ERC'
       ELSE ''
    END ERC,
    ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS ID
FROM 
    tbl_Profile as p
INNER JOIN 
    tbl_Profile_Mortgage as pm ON p.id = pm.FK_ProfileId
LEFT JOIN 
    tbl_ClientFile as cf ON p.ClientId = cf.CLIENTID
LEFT JOIN 
    [dbo].tbl_DDTitles as t ON cf.CLNTTITLE = t.titleid
WHERE 
    pm.MortgageStatus = 7 
    AND p.CaseTypeId = 1
    AND pm.DateCompleted BETWEEN (SELECT DATEADD(YEAR, -4, GETDATE())) AND GETDATE()

此查询返回990条记录

有些客户端将有多个配置文件（

ProfileID

），我只想显示最新的

DateCompleted

的

ProfileID

例如，我有一个客户端ID 5566，这个客户端有3个配置文件，每个配置文件都有自己的Datecompleted，我只想查看基于Datecompleted的最后配置文件信息

任何帮助都将不胜感激

---

干杯

您的一个选择是按

客户机

，

配置文件

对数据进行分区，然后检查哪个

日期完成

的值最大（即

日期秩

为1的值）。然后只选择那些值为1的

select * from
(
    SELECT cf.CLIENTID ,p.Id as ProfileID,t.TITLEDESC as Title,cf.ClntForenme as Name,cf.CLNTSURNME as Surname,pm.Lender,pm.Product,pm.LenderReference,pm.AmountRequested as LoanAmount,
    pm.DateCompleted, 
     CASE 
    WHEN pm.DateCompleted BETWEEN (select dateadd(year, -1, getdate())) AND getdate() THEN 'Compelted Under a year ago'
    WHEN pm.DateCompleted BETWEEN (select dateadd(year, -2, getdate())) AND (select dateadd(year, -1, getdate())) THEN 'Backlog WOM 1 Year'
    WHEN pm.DateCompleted BETWEEN (select dateadd(year, -3, getdate())) AND (select dateadd(year, -2, getdate())) THEN 'Backlog WOM 2 Year'
    WHEN pm.DateCompleted BETWEEN (select dateadd(year, -4, getdate())) AND (select dateadd(year, -3, getdate())) THEN 'Backlog WOM 3 Year'
    ELSE ''
    END Source,
    CASE 
    WHEN pm.Id > 0 THEN 'Check Perspectiove for ERC'
    ELSE ''
    END ERC,
    ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS ID,
    ROW_NUMBER() OVER (Partition by CLIENTID, ProfileID order by DateCompleted desc) as DateRank --Changes here
    FROM tbl_Profile as p
    INNER JOIN tbl_Profile_Mortgage as pm
    ON p.id = pm.FK_ProfileId
    LEFT JOIN tbl_ClientFile as cf
    ON p.ClientId = cf.CLIENTID
    LEFT JOIN [dbo].tbl_DDTitles as t on cf.CLNTTITLE = t.titleid
    WHERE pm.MortgageStatus = 7 and p.CaseTypeId = 1
    AND pm.DateCompleted between (select dateadd(year, -4, getdate())) AND getdate()
) clientinfo
where clientinfo.DateRank = 1

---

感谢您提供的宝贵提示：

（选择dateadd（year，-1，getdate（））

可以简化为

dateadd（year，-1，getdate（））

。将

between

与

datetime

一起使用通常会导致时间问题。显式比较通常更可取。由于

case

“按顺序计算其条件，并以满足其条件的第一个条件停止”，因此不需要在每个

when

子句中检查两个条件，只需在

when

时检查第一个

。为了避免在使用多个
GetDate（）
调用时出现混淆，它有助于捕获单个值，例如
declare@Now as DateTime=GetDate（），并在整个过程中使用该值。