Anyone know why this query takes so long?

SELECT SUM(l.cost+l.fscc) 
FROM orders o, acctg.invoice i
LEFT JOIN acctg.payable p
ON (o.ORD_NO=p.ORD_NO)
WHERE p.ORD_NO IS NULL
AND i.ORD_NO=o.ORD_NO;

Is there something I can do to speed it up?

Thanks,

Richard

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