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Editorial Team
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Asked: 2026-06-18T22:34:15+00:00

Folks, All am looking for is to extend the INNER JOIN. Let me just

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Folks,
All am looking for is to extend the INNER JOIN. Let me just get to the point. I have two tables Dept & Emp. One Dept can have multiple Emp’s & not the other way around.

Table Dept
Dept_id   Dept_Name
1         IT
2         HR
3         Other

Table Emp
Emp_id   Dept_id   Emp_Name
11       1         John
12       1         Jill
13       2         Jack
14       3         Jared
15       1         Jim
16       1         Jarret
17       2         Jacob

I need to JOIN it on Dept_id

Expected Results
Dept_id   Dept_name Emp_id   Emp_Name
1         IT        11       John
NULL      NULL      12       Jill
NULL      NULL      15       Jim
NULL      NULL      16       Jarret
2         HR        13       Jack
NULL      NULL      17       Jacob
3         Other     14       Jared

Hope I conveyed what i want precisely. Its just a regular Inner Join on a Foreign Key Constraint. But, I want the values from the First Table (Dept) to be NULL-ed except for the First Match. That being said, I don’t care what’s the first match. See it below – Just the result for the Dept_id 1.

Expected Results (Only for Dept_id = 1)
It could be

Dept_id   Dept_name Emp_id   Emp_Name
1         IT        11       John
NULL      NULL      12       Jill
NULL      NULL      15       Jim
NULL      NULL      16       Jarret

OR

Dept_id   Dept_name Emp_id   Emp_Name
1         IT        15       Jim
NULL      NULL      12       Jill
NULL      NULL      11       John
NULL      NULL      16       Jarret

OR

Two other possibilities.

Thanks in advance. Sorry for the long explanation even though its a simple case.

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1 Answer

  1. Editorial Team

    I agree with Ic. that this is a crazy query that seems to be doing something that your application should be doing instead of your sql query, that being said, it’s fun to write those queries 🙂

    SELECT CASE WHEN RowNumber = 1 THEN Dept_id ELSE NULL END AS Dept_id,
       CASE WHEN RowNumber = 1 THEN Dept_name ELSE NULL END AS Dept_name,
        Emp_id, Emp_Name
FROM Dept d
INNER JOIN 
(SELECT ROW_NUMBER() OVER (PARTITION BY Dept_id ORDER BY Emp_Name) AS RowNumber, 
       Dept_id, Dept_name, Emp_id, Emp_Name
FROM Emp ) t on t.Dept_id = d. Dept_id
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