CREATE INDEX with order clause

Hi,

I would like to create an index on a table, specifying an order clause
for one of the columns.

CREATE INDEX IDX_GSLOG_EVENT_PLAYER_EVENT_TIME_DESC

ON GSLOG_EVENT(PLAYER_USERNAME,

EVENT_NAME,

EVENT_DATE_CREATED DESC);

which is not a valid, as the order clause DESC is not supported. Such
as index would improve performance of query like:

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?

--

Daniel CAUNE

Ubisoft Online Technology

(514) 4090 2040 ext. 5418