SELECT

a.Eid,

b.cDocNo

FROM

@A a

LEFT OUTER JOIN @B b ON A.Eid = b.cid AND a.DocNo=b.CDocNo

WHERE

Eid IN (SELECT Cid FROM @B)

ORDER BY

a.Eid

That seems to do the trick, unless i've mis-understood what you're after.

Thanks,

Simon