query to ignore duplicate/null records

Question

Below are the 3 tables which we need to join to get the data

 TableA         TableB               TableC
    AId          BId     Name      CId       DeclareDate         


        

Answer 1

Try this one

select a.AID,b.DeclareDate,b.VAL from TABLEA a left outer join (select * from TABLEB where DeclareDate='December') b on a.AID=b.BID order by a.AID asc