php - MYsql query and DB help -

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when trying execute query mysql server cpu usage goes 100% , page stalls. setup index on (client_code, date_time, time_stamp, activity_code, employee_name, id_transaction) doesn't seem help. steps can go next fix issue? there 1 index on database if matters any. thanks

> $sql = "select m.employee_name, count(m.id_transaction)    >from ( select distinct client_code transaction)    > md join transaction m on     > m.id_transaction = ( select   > id_transaction transaction mi   > mi.client_code = md.client_code , date_time=curdate() , time_stamp!='' ,  >  activity_code!='000001'   > order m.employee_name desc, mi.client_code  desc, mi.date_time desc,   > mi.id_transaction desc limit 1 )   > group m.employee_name";

i've got feeling it's due > sign next and, expression you're trying make that?


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