Что за бред... Cost 600%, 800%, 300% ???

SELECT a.saskID, a.data, s.saskID AS Expr1, s.data AS Expr2,
s.statusas, s.sstatusas
FROM abonentai a RIGHT OUTER JOIN
a_statusai s ON a.data = s.data AND
a.saskID = s.saskID
WHERE (s.data BETWEEN '2000.05.01' AND '2000.05.31') AND
(s.statusas = 1) AND (s.sstatusas IS NULL) and a.saskID is not null