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select B.BID,A.MemberName,B.Desc from B left join A on B.MemberID=A.MemberID where B.BID='1'
union all
select C.CID,C.BID,A.MemberName,C.Desc from C left join A on C.MemberID=A.Memberid WHERE C.BID='1'
select
B.BID,a1.MemberName,B.Desc,C.CID,a2.MemberName,C.Desc
from
A a1,A a2,B,C
where
a1.MemberID=B.MemberID and a2.MemberID=C.MemberID and B.BID=C.BID and B.BID=1
select b.*,c.*,a.MemberName from b inner join c on b.bid=c.bid left join a on c.MemberID = a.MemberID