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Editorial Team
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Asked: 2026-05-30T17:41:09+00:00

I’ve two tables which have following columns: Now I want have a SQL query

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I’ve two tables which have following columns:

ERD

Now I want have a SQL query which gives me an output as follows:
SQL output

I wrote already some SQL code, but this doesn’t work because the union operator needs the same number of columns with the same type. Have a look.

SELECT *
FROM
(SELECT User_tbl1.Username, User_tbl1.Surname, User_tbl1.Givename
FROM User_tbl1
UNION
SELECT User_tbl2.User_PK
FROM User_tbl2)

Can someone help me to bring my SQL query working, so that it will output a hyphen at surname and givename if the record is located in table “User_tbl2”?

Thanks a lot!

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1 Answer

  1. Editorial Team

    As simple as:

    SELECT User_tbl1.Username, User_tbl1.Surname, User_tbl1.Givename
FROM User_tbl1
UNION
SELECT User_tbl2.User_PK, '-', '-'
FROM User_tbl2
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