Sql 获取第二个重复记录

我在完成以下连接后得到：

CompanyID            EmpID                Emp_no      Location
-------------------- -------------------- -------------  -------------
1                    24                   100543         First.png
1                    24                   100543         Second.png

我想在select查询中使用CASE选择第二条记录，即second.png。

检查此项

declare @t table(CompanyID int, empid int, emp_no varchar(50), location varchar(100))    
insert into @t values (1,24,100543,'First.png'),(1,24,100543,'Second.png'),(1,25,100544,'Second.png'),(1,25,100544,'First.png')

select * from 
(
select 
    ROW_NUMBER() over(partition by companyid, empid order by companyid, empid ) rowno,  * 
from 
    @t
) a where rowno = 2 --and empid = 24  --here you can give empid to get particular employee detail

如果您想在单个select语句中获取多个empid的第二个条目

declare @t table(CompanyID int, empid int, emp_no varchar(50), location varchar(100))

insert into @t values (1,24,100543,'First.png'),(1,24,100543,'Second.png'),(1,25,100544,'Second.png'),(1,25,100544,'First.png')
,(1,26,100545,'First.png')

;with cte as
(
    select 
        *
    from 
    (
    select 
        ROW_NUMBER() over(partition by  empid order by empid ) rowno,  * 
    from 
        @t
    ) a 
),
cte1 as (
    select
            *,
            ROW_NUMBER() OVER(PARTITION BY empid ORDER BY rowno DESC) as RN
        from cte
)
select * from cte1 where rn = 1

你可以这样写：

;WITH CTE as
(
SELECT ROW_NUMBER() OVER ( PARTITION BY CompanyID,EmpID,Emp_no ORDER BY (SELECT 1))
       AS rownum,CompanyID,EmpID,Emp_no,Location
       FROM (SELECT * FROM @Test ) AS T
),CTE1 as
(
SELECT MAX(rownum) AS maxrownum, 
       CompanyID,
       EmpID,
       Emp_no      
FROM CTE
GROUP BY CompanyID,EmpID,Emp_no
)
SELECT T.CompanyID,T.EmpID,T.Emp_no,T.Location
FROM CTE T
JOIN CTE1 T1 ON T.CompanyID = T1.CompanyID
             AND T.EmpID = T1.EmpID
             AND T.Emp_no = T1.Emp_no
             AND T.rownum = T1.maxrownum

说明：

因为没有像主键那样的列，我们可以通过它来识别 您可以在分区窗口中首先写入SELECT1的行。 一旦获得CompanyID、EmpID和Emp_no的每个组合的行数，就可以使用第二个CTE来获得每个组合的最大行数 结合体 只需从表中收集具有MaxRowNumber的所有行的数据

---

希望这有帮助：

什么决定了第一和第二个？我必须找到这些png文件。是否希望所有行的位置都有“第二个”？显示您的sql查询。