indexing - Please Help me to optimise mysql query containing subqueries for just a few hundred records -


table details-->

create table `redeem_vouchers` (   `voucherid` int(11) not null,   `voucheramount` decimal(18,2) default null,   `redeemedto` int(11) default null,   `redeemedon` datetime default null,   `transid` varchar(100) default null,   `paymentconfirmed` tinyint(1) not null default '0',   `confirmedby` int(11) default null,   `confirmedon` datetime default null,   `redeemedby` int(11) default '0',   primary key (`voucherid`),   key `newindex2` (`redeemedto`),   key `newindex3` (`voucheramount`),   fulltext key `newindex1` (`transid`) ) engine=myisam default charset=latin1;

query-->

select distinct(transid),     (select (count(voucheramount)*16) redeem_vouchers transid = r.transid)  amount,     (select redeemedto redeem_vouchers transid = r.transid limit 0,1) 'name'       redeem_vouchers r       confirmedon  between ('2013-07-23 19:00:00') , ('2013-07-24 19:00:00')

table contains 4909 rows , query taking 35 seconds return result. have added 4 indexes found no speed gain. know doing dangerous new sql. please me.

i try query, uses group by:

select   transid,   count(voucheramount)*16 amount,   redeemedto `name`   redeem_vouchers   confirmedon between '2013-07-23 19:00:00' , '2013-07-24 19:00:00' group   transid

redeemedto non-aggregated column, , value undetermined, undetermined in original query since using limit first record, not using order by.

if redeemedto values same, fine - or can use

max(redeemedto) `name`

to make query sql standard.


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