Sql 如何编写查询以获取多级数据

我有以下四个表格：

tblAccount

但是没有得到正确的输出。 请帮帮我

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提前感谢大家。

您可以将现有查询包装在一个公共表表达式中，并使用ROW_NUMBER按tblRSCMaster.DateOfAddition条目按tblAccountwiseLocation.LocId仅获取最后3个条目

WITH cte AS (
  SELECT tblAccountwiseLocation.LocId,
       tblAccountwiseLocation.AccId,
       tblRSCMaster.RSCNo,
       tblRSCMaster.DateOfAddition,
       ROW_NUMBER() OVER (PARTITION BY tblAccountwiseLocation.LocId
                          ORDER BY tblRSCMaster.DateOfAddition DESC) rn
  FROM   tblAccountwiseLocation
  INNER JOIN tblRSCMaster 
    ON tblAccountwiseLocation.LocId = tblRSCMaster.LocId
   AND tblAccountwiseLocation.AccId = tblRSCMaster.AccId
  WHERE tblRSCMaster.AccId=1
)
SELECT LocId, AccId, RSCNo, DateOfAddition
FROM cte
WHERE rn <= 3
ORDER BY LocId, AccId, DateOfAddition

这就是你需要的吗

select m.*
from (select m.*, row_number() over (partition by accID
                                     order by DateOfAddition desc) as seqnum
      from tblRSCMaster
      where m.locid = 1
     ) m
where seqnum <= 3
order by AccId, DateOfAddition;

---

我认为您需要根据locid而不是AccId进行筛选，以获得所需的内容。

当您只需要一个表时，为什么需要内部联接？顺便说一句，您确实告诉了我们您要检索的记录的确切条件？我需要所有位置的最后三个RSC属于AccountA。thatsy inner加入表格以获得结果。@Edper:我已经编辑了我的问题。请帮帮我，谢谢。我得到了答案。

Id is primary key.

+----+---------------+ | Id | LocName | +----+---------------+ | 1 | LocationA | | 2 | LocationB | | 3 | LocationC | +----+---------------+

Id i sprimary key.LocId and AccId are foreign key.

+----+---------------+---------------+ | Id | LocId | AccId | +----+---------------+---------------+ | 1 | 1 | 1 | | 2 | 2 | 1 | | 3 | 3 | 1 | | 4 | 1 | 2 | | 5 | 2 | 2 | | 6 | 3 | 2 | +----+---------------+---------------+

Id i sprimary key.LocId and AccId are foreign key.

+----+---------------+---------------+----------------+------------------+ | Id | LocId | AccId | RSCNo | DateOfAddition | +----+---------------+---------------+----------------+------------------+ | 1 | 1 | 1 | Acc1_Loc1_1_14 | 15/01/2014 | | 2 | 2 | 1 | Acc1_Loc2_1_14 | 15/01/2014 | | 3 | 3 | 1 | Acc1_Loc2_1_14 | 15/01/2014 | | 4 | 1 | 2 | Acc2_Loc1_1_14 | 15/01/2014 | | 5 | 2 | 2 | Acc2_Loc2_1_14 | 15/01/2014 | | 6 | 3 | 2 | Acc2_Loc3_1_14 | 15/01/2014 | | 7 | 1 | 1 | Acc1_Loc1_2_14 | 15/02/2014 | | 8 | 2 | 1 | Acc1_Loc2_2_14 | 15/02/2014 | | 9 | 3 | 1 | Acc1_Loc3_2_14 | 15/02/2014 | | 10 | 1 | 2 | Acc2_Loc1_2_14 | 15/02/2014 | | 11 | 2 | 2 | Acc2_Loc2_2_14 | 15/02/2014 | | 12 | 3 | 2 | Acc2_Loc3_2_14 | 15/02/2014 | | 13 | 1 | 1 | Acc1_Loc1_3_14 | 15/03/2014 | | 14 | 2 | 1 | Acc1_Loc2_3_14 | 15/03/2014 | | 15 | 3 | 1 | Acc1_Loc3_3_14 | 15/03/2014 | | 16 | 1 | 2 | Acc2_Loc1_3_14 | 15/03/2014 | | 17 | 2 | 2 | Acc2_Loc2_3_14 | 15/03/2014 | | 18 | 3 | 2 | Acc2_Loc3_3_14 | 15/03/2014 | | 19 | 1 | 1 | Acc1_Loc1_4_14 | 15/04/2014 | | 20 | 2 | 1 | Acc1_Loc2_4_14 | 15/04/2014 | | 21 | 3 | 1 | Acc1_Loc3_4_14 | 15/04/2014 | | 22 | 1 | 2 | Acc2_Loc1_4_14 | 15/04/2014 | | 23 | 2 | 2 | Acc2_Loc2_4_14 | 15/04/2014 | | 24 | 3 | 2 | Acc2_Loc3_4_14 | 15/04/2014 | | 25 | 1 | 1 | Acc1_Loc1_5_14 | 15/05/2014 | | 26 | 2 | 1 | Acc1_Loc2_5_14 | 15/05/2014 | | 27 | 3 | 1 | Acc1_Loc3_5_14 | 15/05/2014 | | 28 | 1 | 2 | Acc2_Loc1_5_14 | 15/05/2014 | | 29 | 2 | 2 | Acc2_Loc2_5_14 | 15/05/2014 | | 30 | 3 | 2 | Acc2_Loc3_5_14 | 15/05/2014 | +----+---------------+---------------+----------------+------------------+ +---------------+---------------+----------------+------------------+ | LocId | AccId | RSCNo | DateOfAddition | +---------------+---------------+----------------+------------------+ | 1 | 1 | Acc1_Loc1_3_14 | 15/03/2014 | | 1 | 1 | Acc1_Loc1_4_14 | 15/04/2014 | | 1 | 1 | Acc1_Loc1_5_14 | 15/05/2014 | | 2 | 1 | Acc1_Loc2_3_14 | 15/03/2014 | | 2 | 1 | Acc1_Loc2_4_14 | 15/04/2014 | | 2 | 1 | Acc1_Loc2_5_14 | 15/05/2014 | | 3 | 1 | Acc1_Loc3_3_14 | 15/03/2014 | | 3 | 1 | Acc1_Loc3_4_14 | 15/04/2014 | | 3 | 1 | Acc1_Loc3_5_14 | 15/05/2014 | +---------------+---------------+----------------+------------------+

   SELECT tblAccountwiseLocation.LocId,tblAccountwiseLocation.AccId,tblRSCMaster.RSCNo,tblRSCMaster.DateOfAddition FROM   tblAccountwiseLocation
   INNER JOIN tblRSCMaster ON tblAccountwiseLocation.LocId= tblRSCMaster.LocId
   where tblRSCMaster.AccId=1

WITH cte AS (
  SELECT tblAccountwiseLocation.LocId,
       tblAccountwiseLocation.AccId,
       tblRSCMaster.RSCNo,
       tblRSCMaster.DateOfAddition,
       ROW_NUMBER() OVER (PARTITION BY tblAccountwiseLocation.LocId
                          ORDER BY tblRSCMaster.DateOfAddition DESC) rn
  FROM   tblAccountwiseLocation
  INNER JOIN tblRSCMaster 
    ON tblAccountwiseLocation.LocId = tblRSCMaster.LocId
   AND tblAccountwiseLocation.AccId = tblRSCMaster.AccId
  WHERE tblRSCMaster.AccId=1
)
SELECT LocId, AccId, RSCNo, DateOfAddition
FROM cte
WHERE rn <= 3
ORDER BY LocId, AccId, DateOfAddition

select m.*
from (select m.*, row_number() over (partition by accID
                                     order by DateOfAddition desc) as seqnum
      from tblRSCMaster
      where m.locid = 1
     ) m
where seqnum <= 3
order by AccId, DateOfAddition;