Group By Except For Certain Value

Question

I\'m trying to create a (sqlite) query that will perform a GROUP BY but will not group anything with the value \'unknown\'. For example, I have the table:

i         


        

Answer 1

You can't easily do this with one statement but you can UNION the results of two statements

• GROUP the list of all but unknown
• Add (UNION) the list of all unknown

SQL Statement

SELECT MIN(id), name, parent_id, school_id
FROM   YourTable
WHERE  name <> 'unknown'
GROUP BY
       name, parent_id, school_id
UNION ALL
SELECT id, name, parent_id, school_id
FROM   YourTable
WHERE  name = 'unknown'

Note that I assume you have posted wrong unknown id's in your result