Question

我有一个基于ID的联接表，但我只想加入具有该ID最大“PeriodDT”（日期时间列）的行。

我已尝试使用“PeriodDT”的前1个订单，但它只会让我选择一列或我收到错误：

当选择列表中只能指定一个表达式时子查询不是用EXISTS引入的

这是我使用的查询：

Select  a.Name as PropertyName,
        a.PropertyNum as PropertyNum,
        a.City as City,
        a.State as State,
        b.Name as LoanName,
        b.LoanNum,
        (select Top 1 c.IntRate as IntRate,
        c.MaturityDT    
        from vNoteDetail c where c.LoanID = b.LoanID Order By c.PeriodDT DESC)
from vProperty a join vLoan b on a.LoanID = b.LoanId

有更好的方法吗？

Answer 1

试试这个..

;WITH cte 
     AS (SELECT Row_number() OVER(partition BY clientid ORDER BY perioddt DESC) rn, 
                intrate, 
                perioddt                    MaturityDT, 
                loanid 
         FROM   vnotedetail) 
SELECT a.NAME        AS PropertyName, 
       a.propertynum AS PropertyNum, 
       a.city        AS City, 
       a.state       AS State, 
       b.NAME        AS LoanName, 
       b.loannum, 
       c.intrate, 
       c.maturitydt, 
FROM   vproperty a 
       JOIN vloan b 
         ON a.loanid = b.loanid 
       JOIN cte c 
         ON c.loanid = b.loanid 
WHERE  c.rn = 1

子查询CHECK THIS

的FYI限制

Answer 2

尝试

Select  a.Name as PropertyName,
    a.PropertyNum as PropertyNum,
    a.City as City,
    a.State as State,
    b.Name as LoanName,
    b.LoanNum,
    v1.IntRate,
    v1.MaturityDT    
from vProperty a join vLoan b on a.LoanID = b.LoanId
CROSS APPLY         (select Top 1 c.IntRate as IntRate,
    c.MaturityDT    
    from vNoteDetail c where c.LoanID = b.LoanID Order By c.PeriodDT DESC) AS V1

使用最大日期加入

2 个答案: