Re: CREATE INDEX with order clause

On Wed, 2006-02-01 at 10:46 -0500, Daniel Caune wrote:
> Hi,
> 
[snip need for reverse-sort operator class]

> 
> SELECT GAME_CLIENT_VERSION
>   FROM GSLOG_EVENT
>   WHERE PLAYER_USERNAME = ?
>     AND EVENT_NAME = ?
>     AND EVENT_DATE_CREATED < ?
>   ORDER BY EVENT_DATE_CREATED DESC
>   LIMIT 1

>  
> 
> Actually, I’m not sure that is useful; perhaps PostgreSQL handles
> pretty well such query using an index such as:
> CREATE INDEX IDX_GSLOG_EVENT_PLAYER_EVENT_TIME_DESC
>   ON GSLOG_EVENT(PLAYER_USERNAME,
>                  EVENT_NAME,
>                  EVENT_DATE_CREATED);
>  
> 
> Any idea?

does index work with: SELECT GAME_CLIENT_VERSION     FROM GSLOG_EVENT    WHERE PLAYER_USERNAME = ?      AND EVENT_NAME
=?      AND EVENT_DATE_CREATED < ?    ORDER BY PLAYER_USERNAM DESC,             EVENT_NAME DESC,
EVENT_DATE_CREATEDDESC    LIMIT 1
 

gnari