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Editorial Team
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Asked: 2026-05-26T00:59:07+00:00

I’ve got an interesting dilemma now. I have a database schema like the following:

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I’ve got an interesting dilemma now. I have a database schema like the following:

GameList:
+-------+----------+-----------+------------+--------------------------------+
|  id   | steam_id | origin_id | impulse_id |           game_title           |
+-------+----------+-----------+------------+--------------------------------+
|   1   |   17450  |   NULL    |    NULL    |      Dragon Age: Origins       |
|   2   |   NULL   | 138994900 |    NULL    |    Dragon Age(TM): Origins     |
|   3   |   NULL   |   NULL    |  dragonage |      Dragon Age Origins        |
|   4   |   47850  | 201841300 |  fifamgr11 |        FIFA Manager 11         |
|  ...  |   ...    |    ...    |     ...    |              ...               |
+-------+----------+-----------+------------+--------------------------------+

GameAlias:
+----------+-----------+
|  old_id  |  new_id   |
+----------+-----------+
|    2     |     1     |
|    3     |     1     |
|   ...    |    ...    |
+----------+-----------+

Depending on whether the stores use the same title for the game there may be no issues, or there may be multiple rows for the same game. The Alias table exists to resolve this issue, by stating that id 2 and id 3 are just aliases for id 1.

What I need is an SQL query which uses both the GameList table and the GameAlias table and returns the following:

ConglomerateGameList:
+-------+----------+-----------+------------+--------------------------------+
|  id   | steam_id | origin_id | impulse_id |           game_title           |
+-------+----------+-----------+------------+--------------------------------+
|   1   |   17450  | 138994900 |  dragonage |      Dragon Age: Origins       |
|   4   |   47850  | 201841300 |  fifamgr11 |        FIFA Manager 11         |
|  ...  |   ...    |    ...    |     ...    |              ...               |
+-------+----------+-----------+------------+--------------------------------+

Note that I want the game title of the “new id”. The game title for any “old ids” should simply be discarded/ignored.

I would also like to note that I can’t make any modifications to the GameList table to solve this issue. If I were to simply re-write the table to look like my desired output then every night when I grab an updated game list from the stores it would fail to find the game in the database, generating yet another row like so:

+-------+----------+-----------+------------+--------------------------------+
|  id   | steam_id | origin_id | impulse_id |           game_title           |
+-------+----------+-----------+------------+--------------------------------+
|   1   |   17450  | 138994900 |  dragonage |      Dragon Age: Origins       |
|   4   |   47850  | 201841300 |  fifamgr11 |        FIFA Manager 11         |
|  ...  |   ...    |    ...    |     ...    |              ...               |
|  8139 |   NULL   | 138994900 |    NULL    |     Dragon Age(TM): Origins    |
|  8140 |   NULL   |    NULL   |  dragonage |      Dragon Age Origins        |
+-------+----------+-----------+------------+--------------------------------+

I also can’t work on the assumption that a game’s id will never change as Steam has been known to change them when a major update to the game is released.

Bonus points if it can recognize recursive aliases, like the following:

GameAlias:
+----------+-----------+
|  old_id  |  new_id   |
+----------+-----------+
|    2     |     1     |
|    3     |     2     |
|   ...    |    ...    |
+----------+-----------+

Since id 3 is an alias for id 2 which itself is an alias for id 1. If recursive aliases is impossible then I can just develop my application logic to prevent them.

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1 Answer

  1. Editorial Team

    Does this work? Correct the table names.

    select ga1.new_id, max(gl1.steam_id), max(gl1.origin_id), max(gl1.impulse_id),
max(if(gl1.id = ga1.new_id,gl1.game_title,NULL)) as game_title
from gl1, ga1
where (gl1.id = ga1.new_id OR gl1.id = ga1.old_id)
group by ga1.new_id

union

select gl2.id, gl2.steam_id, gl2.origin_id, gl2.impulse_id, gl2.game_title
from gl2, ga2
where (gl2.id not in (
    select ga3.new_id from ga3
    union
    select ga4.old_id from ga4))
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