使用分区依据的SQL查询

Question

我有以下表名JobTitle

JobID LanaguageID
-----------------
1         1
1         2
1         3
2         1
2         2 
3         4
4         5
5         2

我从表中选择所有记录,除了重复JobID的计数> 1.我只从重复的JobID中选择一个记录/第一行.现在我将LanguageID作为参数传递给存储过程,我想为该languageID选择重复的JobID以及其他记录.如果我已将languageID作为1传递,则输出应如下所示

JobID LanaguageID
-----------------
1         1
2         1
3         4
4         5
5         2

我尝试过使用以下查询.

with CTE_RN as
(
    SELECT ROW_NUMBER() OVER(PARTITION BY JobTitle.JobID ORDER BY JobTitle.JobTitle) AS RN
    FROM JobTitle
    INNER JOIN JobTitle_Lang
        ON JobTitle.JobTitleID = JobTitle_Lang.JobTitleID
)

但我无法在上面的查询中使用WHERE子句.是否应遵循任何不同的方法.或者我如何修改查询以获得所需的输出

Answer 1

with CTE_RN as
(
    SELECT
        JobID, LanaguageID,
        ROW_NUMBER() OVER(PARTITION BY JobTitle.JobID ORDER BY JobTitle.JobTitle) AS RN
    FROM JobTitle
        INNER JOIN JobTitle_Lang ON JobTitle.JobTitleID = JobTitle_Lang.JobTitleID
)
select
from CTE_RN
where RN = 1 or LanguageID = @LanguageID

更新

简化了一点(加入删除),但你会明白:

declare @LanguageID int = 2

;with cte_rn as
(
    select
        JobID, LanguageID,
        row_number() over(
          partition by JobTitle.JobID
          order by
              case when LanguageID = @LanguageID then 0 else 1 end, 
              LanguageID
        ) as rn
    from JobTitle
)
select *
from cte_rn
where rn = 1

sql fiddle demo