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_CREATED DESC
LIMIT 1

gnari