SELECT a.BID, a.BTitle, a.BName, b.RID, b.RName, b.RDate, b.RNum,
b.BID AS Expr1
FROM Oa_BBS a INNER JOIN
Oa_Reply b ON a.BID = b.BID
where b.RID = (select max(rid) from Oa_Reply)
ORDER BY a.BID DESC
b.BID AS Expr1
FROM Oa_BBS a INNER JOIN
Oa_Reply b ON a.BID = b.BID
where b.RID = (select max(rid) from Oa_Reply)
ORDER BY a.BID DESC
b.BID AS Expr1
FROM Oa_BBS a INNER JOIN
Oa_Reply b ON a.BID = b.BID and b.rid=(select max(rid) from oa_reply where bid=b.bid)
ORDER BY a.BID DESC
on b.BID=k.BID and b.rid=k.rid