Re: Subquery with range uses filesort
Rick,
Thank you.
I'm not sure the "(a,b) = (c,d)" is the problem since the query below
also uses a filesort. I don't know how to turn it into a join.
Currently, I'm using a temporary table (which works OK).
explain extended select * from Player
join History on HistoryPlayer = PlayerID and
HistoryDate =
( select HistoryDate
from History
where HistoryPlayer = PlayerID and HistoryDate <= '2013-01-01'
order by HistoryDate desc, HistoryDirector desc limit 0,1 )
id,select_type,table,type,possible_keys,key,key_len,ref,rows,filtered,Extra
1,PRIMARY,History,ALL,PlayerDateDirector,NULL,NULL,NULL,880850,100.00,
1,PRIMARY,Player,eq_ref,PRIMARY,PRIMARY,4,ratingscentral.History.HistoryPlayer,1,100.00,"Using where"
2,"DEPENDENT SUBQUERY",History,ref,PlayerDateDirector,PlayerDateDirector,4,ratingscentral.Player.PlayerID,8808,100.00,"Using where; Using index; Using filesort"
Subject
Views
Written By
Posted
3961
November 16, 2013 02:42PM
1411
November 17, 2013 07:42PM
Re: Subquery with range uses filesort
1415
November 17, 2013 08:01PM
1414
November 18, 2013 04:33PM
1946
November 18, 2013 07:54PM
1645
November 19, 2013 04:10PM
1498
November 19, 2013 08:36PM
1578
November 21, 2013 02:55PM
1782
December 05, 2013 03:46PM
1432
December 07, 2013 02:10PM
1395
December 09, 2013 06:08PM
1418
December 14, 2013 09:51PM
1363
December 14, 2013 10:17PM
1444
December 15, 2013 11:29PM
1487
December 17, 2013 06:58PM
1421
December 18, 2013 05:49PM
1479
December 18, 2013 08:28PM
1514
December 19, 2013 10:13PM
1489
December 19, 2013 10:28PM
1340
December 20, 2013 07:06PM
1432
December 21, 2013 07:36AM
1480
December 22, 2013 10:01AM
1528
December 22, 2013 10:45AM
1391
December 25, 2013 09:30PM