On 6/2/05, K C Lau [EMAIL PROTECTED] wrote:
...
select DISTINCT ON (PlayerID) PlayerID,AtDate from Player where
PlayerID='0' order by PlayerID desc, AtDate desc;
The Player table has primary key (PlayerID, AtDate) representing data over
time and the query gets the latest data for a
On 6/8/05, K C Lau [EMAIL PROTECTED] wrote:
Both keys are text fields. Does it make any difference if PlayerID were
integer?
It can make a difference in speed and integrity. If the column is an
integer, the storage on disk could be smaller for the column and the
related indexes. If the the
Previously, we have also tried to use LIMIT 1 instead of DISTINCT, but
the performance was no better:
select PlayerID,AtDate from Player where PlayerID='0' order by
PlayerID desc, AtDate desc LIMIT 1
The DISTINCT query will pull out all the rows and keep only one, so the
one with
At 19:45 05/06/06, PFC wrote:
Previously, we have also tried to use LIMIT 1 instead of DISTINCT, but
the performance was no better:
select PlayerID,AtDate from Player where PlayerID='0' order by
PlayerID desc, AtDate desc LIMIT 1
The DISTINCT query will pull out all the rows and
