Re: UPDATE with correlatted subquery

From: Ganesh Raja <ganesh_at_gtfs-gulf.com>
Date: 3 Feb 2002 02:07:23 -0800
Message-ID: <a8aed4.0202030207.2af08fc1@posting.google.com>

"Jesus M. Salvo Jr." <john_at_softgame.com.au> wrote in message news:<c_r68.28065$Ni2.154878_at_news-server.bigpond.net.au>...
> I want to update multiple rows but one column of a table based on a
> subquery. The idea is to increase ( or decrease ) the points of a player
> based on additional points that he/she may have earned after a certain
> period:
>
> UPDATE points_ranking
> SET points =
> (
> SELECT points_ranking.points + SUM( b.points )
> FROM sgtest.game a, sgtest.transaction b, sgtest.player c
> WHERE
> a.game_type_id = 10 AND
> c.service_provider_id = 3 AND
> b.game_id = a.game_id AND
> b.player_id = c.player_id AND
> c.player_id (+) = points_ranking.player_id AND
> a.start_date > fromdate
> GROUP BY 3, 10, c.player_id
> )
> WHERE
> service_provider_id = 3 AND
> game_type_id = 10;

 UPDATE points_ranking
 SET points = points_ranking.points +

    Nvl( (
    SELECT SUM( b.points )

     FROM sgtest.game a, sgtest.transaction b, sgtest.player c
     WHERE
      a.game_type_id = 10 AND
      c.service_provider_id = 3 AND
      b.game_id = a.game_id AND
      b.player_id = c.player_id AND
      c.player_id (+) = points_ranking.player_id AND
      a.start_date > fromdate
     GROUP BY 3, 10, c.player_id

    ),0)
 WHERE
    service_provider_id = 3 AND
    game_type_id = 10;

This Works In 8.1.7

>
>
> ... where fromdate is a variable.
>
>
> However, the points column is NOT NULL, and it is possible that the
> correlational subquery may not return any rows for the player where it is
> correlated to ... resulting in a:
>
> ORA-01407: cannot update ("AGGREGATOR"."POINTS_RANKING"."POINTS") to NULL
>
> Does anybody have an idea on how to perform an UPDATE from a correlational
> subquery that ensures that each row being UPDATEd has a row from the
> correlated subquery?
>
> I have tried placing an outer join either way ... still the same.
>
>
> John

Regards,
Ganesh R Received on Sun Feb 03 2002 - 04:07:23 CST