Question

我想做的是返回所有拥有enddate <= GETDATE()的人，但我需要首先从MAX(enrollmentID)表中读取managementTempTable。这是我到目前为止的内容：

select personID, firstName, lastName, [GUID], ouPath 
from managementTable
where personID in 
(
    select personID 
    from 
    (
        select personID 
        from managementTempTable
        where endDate <= GETDATE()
        group by personID
    ) as tbl
) 
and accountEnabled = 1

我知道这行不通，因为它返回具有endDate <= GETDATE()的数据行。它需要读取MAX(enrollmentID)，然后评估是否endDate <= GETDATE()。

managementTempTable中的数据如下：

enrollmentID,personID,firstName,lastName,endDate
61490,18213,John,Doe,8/23/2018
64766,18213,John,Doe,NULL
64720,18570,Jane,Doe,10/18/2018
64862,18570,Jane,Doe,NULL

所需结果如下：

enrollmentID,personID,firstName,lastName,endDate
64766,18213,John,Doe,NULL
64862,18570,Jane,Doe,NULL

Answer 1

为什么不使用row_number()？：

select mt.*
from (select mt.*,
             row_number() over (partition by personid order by enrollmentID desc) as seq
      from managementTable mt
      where . . . 
     ) mt
where mt.seq = 1;

Answer 2

如果您想按MAX来获得enrollmentID行，可以尝试在where中使用子查询

SELECT t1.* 
FROM managementTempTable t1
WHERE enrollmentID = (
    SELECT MAX(enrollmentID)
    FROM managementTempTable tt
    WHERE t1.personID = tt.personID
)

SQLFIDDLE

Answer 3

这将为您提供帮助

 SELECT * 
    FROM managementTempTable 
    WHERE enrollmentID in (
          Select max(enrollmentID) EId
          FROM managementTempTable
          where isnull(enddate,getdate()) <= Getdate()
          group by PersonId)

SQL使用max返回多列，但每个用户仅一行

3 个答案: