从子查询中选择SQL

Question

我有一个表，其中的合同ID具有多个值。

SELECT contractid
    ,milestoneid
    ,DATE
    ,type
    ,RANK() OVER (PARTITION BY contractid ORDER BY Milestoneid ASC) AS RankNbr
FROM [TSWDATA].[dbo].t_milestone
WHERE contractid = 1056229


contractid milestoneid  date        type               RankNbr
1056        43269       10/10/15    Full                1
1056        43449       10/26/15    GB                  2
1056        43456       10/26/15    Submit for Funding  3
1056        43463       10/26/15    Cleared             4

我需要加入主合同表并仅在值“ GB”是最大里程碑数时才拉合同。

我可以在where子句中这样做吗？

Answer 1

这对您有用吗？

 SELECT contractid
      ,milestoneid
     ,DATE
     ,type
     ,RANK() OVER (PARTITION BY contractid ORDER BY Milestoneid ASC) AS    RankNbr
 FROM [TSWDATA].[dbo].t_milestone
 WHERE EXISTS (SELECT TOP (1) *
               FROM SubTable AS s
               WHERE s.type = 'GB'
                 AND s.contractID = [TSWDATA].[dbo].t_milestone.contractid
               ORDER BY s.milestoneID DESC
              )
   AND contractid = 1056229

Answer 2

如果您需要合同表中的记录，则可以加入排名查询中。 只需将订单更改为DESC，即可使RankNbr 1成为最大里程碑

SELECT * 
FROM [TSWDATA].[dbo].t_contract c
JOIN (
    SELECT contractid
        ,type
        ,RANK() OVER (PARTITION BY contractid ORDER BY Milestoneid DESC) AS RankNbr
    FROM [TSWDATA].[dbo].t_milestone
) ms ON ms.contractid = c.contractid
WHERE 
    --contractid = 1056229 AND 
    ms.RankNbr = 1 AND ms.type = 'GB'