Question

I have a query that after execution shows:

Name  | LasName | City
-------------------------
John  | Doe     | London
John  | Doe     | Berlin
Martin| Smith   | Paris

Is there anything I can do in the WHERE clause section in order to get just one John Doe, no matter the city?

The query is humongous that’s why I’m not posting it in here.

If there’s anything you think I can do, please, post a fake query explaining it, I just need to get the concept.

Thanks a lot!

Answer 1

You don’t state RDBMS. One way that should work in all.

SELECT Name,
       LasName,
       MAX(City) AS City
FROM   YourQuery
GROUP  BY Name,
          LasName 

You say you don’t care which city. This gives you the last alphabetically.

Or an alternative

SELECT Name,
       LasName,
       City
FROM   (SELECT Name,
               LasName,
               City,
               ROW_NUMBER() OVER (PARTITION BY Name, LasName ORDER BY (SELECT 0)) AS RN
        FROM   YourQuery) T
WHERE  RN = 1