Home/ Questions/Q 7520859
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-30T02:08:24+00:00

I am trying to find an error in a massive SQL statement (not mine)

  • 0

I am trying to find an error in a massive SQL statement (not mine) – I have cut a lot of it out to make it readable – even pared down it still throws the error

SELECT DISTINCT Profiles.ID 
FROM 
   (select * from Profiles RIGHT JOIN FriendList ON (FriendList.Profile = 15237) 
    order by LastLoggedIn DESC ) as Profiles

This returns an error

Duplicate column name ‘ID’

I have tested the the last part (select * from Profiles ... order by LastLoggedIn DESC) and it works fine by itself

I have tried to troubleshoot by changing column names in the DISTINCT section without any luck.

One solution I read was to remove the DISTINCT, but that didn’t help.

I just can’t see where the duplicate column error can be coming from. Could it be a database integrity problem?

Any help much appreciated.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Your Profile and FriendList tables both have an ID column. Because you say select *, you’re getting two columns named ID in the sub-select which is aliased to Profiles, and SQL doesn’t know which one Profiles.ID refers to (note that Profiles here is referring to the alias of the sub-query, not the table of the same name).

    Since you only need the ID column, you can change it to this:

    SELECT DISTINCT Profiles.ID FROM 
( select Profiles.ID from Profiles RIGHT JOIN FriendList ON (FriendList.Profile = 15237) 
order by LastLoggedIn DESC ) as Profiles
    • 0