mysql>select count(*) from x.table_a,y.table_b WHERE x.table_a.svr = y.table_b.svr and x.table_a.started = y.table_b.started and x.table_a.ended = y.table_b.ended and x.table_a.volume = y.table_b.volume and x.table_a.who = y.table_b.who;
you didn't say that (svr,started,ended,volume,who) is a unique key... If not, it would explain the result and the extra rows you get.
-- Philippe Poelvoorde COS Trading Ltd.
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