仅使用内部联接的单个或多个出现记录

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

获取上述数据，现在我只想获取所有项目（cnfRptClmId,cnfCategory|cnfNumber|cnfState） a) 一种或单一类型的类别加 ClmNumber 列 (T2|B) 即 (|21347|1660|T2|B| 3) 和类似记录

b）所有记录只出现两次，忽略其余记录，即

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

我可以为这两个结果提供两个单独的查询。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) 将在每一行上为您提供 dsccnf.Category 的计数，因此您只需将其包装在子查询中并仅选择类别计数 = 2 的记录

根据下面的评论..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按它进行过滤。

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