只有一次或多次出现使用内部连接的记录

Question

我有以下查询。

select 
dsccnf.Id cnfRptClmId,dsccnf.tblRptcatId cnfRptcatId,dsccnf.Category cnfCategory, 
dsccnf.ClmNumber cnfNumber,dsccnf.State cnfState 
from tblClmPeriod dcp 
inner join tblRptClm dsccnf on dsccnf.tblClmPeriodId = dcp.Id and dsccnf.State=3 --and dsccnf.tblClmPeriodId = 10288 

|cnfRptClmId|cnfRptcatId|cnfCategory|cnfNumber|cnfState 
|21341  |1650  |L2   |A  | 3 
|21343  |1652  |L2   |A  | 3 
|21345  |1657  |T1   |A  | 3 
|21347  |1660  |T2   |B  | 3 
|21356  |1670  |T1   |A  | 3 

获取以上数据，现在我只是想获得的所有项目（cnfRptClmId，cnfCategory | cnfNumber | cnfState） 一）一类或单一类型的分类加ClmNumber列（T2 | B），即（| 21347 | 1660 | T2 | b | 3）和类似的记录

b）中的所有记录中出现的唯一的两倍，而忽略其余即

|21341|1650|L2|A|3 
|21343|1652|L2|A|3 
|21345|1657|T1|A|3 
|21356|1670|T1|A|3 

我可以得到两种单独的查询为这两个结果。预先感谢。

Answer 1

SELECT * 
FROM 
(
    SELECT 
     dsccnf.Id cnfRptClmId, 
     dsccnf.tblRptcatId cnfRptcatId, 
     dsccnf.Category cnfCategory, 
     dsccnf.ClmNumber cnfNumber, 
     dsccnf.State cnfState, 
     COUNT(dsccnf.Category) OVER (PARTITION BY dsccnf.Category) categoryCount 
    FROM 
     tblClmPeriod dcp 
     INNER JOIN tblRptClm dsccnf ON dsccnf.tblClmPeriodId = dcp.Id 
             AND dsccnf.State = 3 
) 
WHERE categoryCount = 2 

COUNT(dsccnf.Category) OVER (PARTITION BY dsccnf.Category)会给你为dsccnf.Category上每一行的数量，所以你只是包装在一个子查询并仅选择有基于下面的评论类别数= 2

的记录。 。您可以为dsccnf.Category和dsccnf.ClmNumber添加另一个计数，然后检查该计数是否要过滤它。

SELECT * 
FROM 
(
    SELECT 
     dsccnf.Id cnfRptClmId, 
     dsccnf.tblRptcatId cnfRptcatId, 
     dsccnf.Category cnfCategory, 
     dsccnf.ClmNumber cnfNumber, 
     dsccnf.State cnfState, 
     COUNT(dsccnf.Category) OVER (PARTITION BY dsccnf.Category) categoryCount, 
     COUNT(dsccnf.Category) OVER (PARTITION BY dsccnf.Category, dsccnf.ClmNumber) categoryClmCount 
    FROM 
     tblClmPeriod dcp 
     INNER JOIN tblRptClm dsccnf ON dsccnf.tblClmPeriodId = dcp.Id 
             AND dsccnf.State = 3 
) 
WHERE categoryCount = 2 -- where category appears twice 
     OR categoryClmCount = 1 -- where category/clm appear only once 

Answer 2

试试这个：

select 
    dsccnf.Id   cnfRptClmId, 
    dsccnf.tblRptcatId cnfRptcatId, 
    dsccnf.Category cnfCategory, 
    dsccnf.ClmNumber cnfNumber, 
    dsccnf.State  cnfState 
from tblClmPeriod dcp 
inner join tblRptClm dsccnf on dsccnf.tblClmPeriodId = dcp.Id 
          and dsccnf.State=3 
group by 
    dsccnf.Id, 
    dsccnf.tblRptcatId, 
    dsccnf.Category, 
    dsccnf.ClmNumber, 
    dsccnf.State 
having count(*) = 2