SQL Query not showing expected result

Question

So im creating a integration script, but for some reason its not showing the exprected result. My query is

SELECT xf_user_group_relation.user_id, xf_user_gro         


        

Answer 1

Try changing the GROUP BY to

GROUP BY
   xf_user_group_relation.user_id, xf_user_group_relation.user_group_id

Most other DBMS would throw an error for that query because every column in the SELECT list must be either aggregated or in the GROUP BY.

Edit: this is a great example of why ANSI-SQL and other RDBMS do not allow this syntax