Question

I have a database in SQLServer in which there are multiple rows for a database named emp_details. The table contains several fields, one of which is salary. The salary is not unique for the employees, and I need to fetch one complete row for each unique salary value.

Kindly let me know the query which may help.

A sample of the database:

a   b       c   d       e   f

17  IL11    53  IL11    48  58
26  IL10    53  IL10    48  58
31  IL15    53  IL15    48  58
32  IL16    53  IL16    24  58
33  IL17    53  IL17    36  58
34  IL18    53  IL18    36  58
37  IL21    53  IL21    36  58
40  IL24    53  IL24    48  58

I want to filter this on column e (assume it to be salary field)

Answer 1

Unsure if this is better performance wise as there is no schema. But this should work.

WITH Emp_Salary
AS
(
    SELECT 
        Column1
        , Column2
        , Salary
        , ROW_NUMBER() OVER (PARTITION BY Salary ORDER BY Column1) r  --numbers each row uniquely per salary
        FROM emp_details
)
SELECT
    Column1
    , Column2
    , Salary
FROM Emp_Salary
WHERE r = 1 -- Filters all but the first row per salary.
;