Oracle Query with Left join and multiple conditions

I have oracle database with Tbl1with fileds fld1, fld2
           Tb9 with fields   Name, Tbl9UID

 I need to look  
      If  Tbl1.Fld1 in ( 1,2,3) then
            if  fld1 ||  fld2 = Tb9.Name  then return  Tbl9UID
      else  if fld1 = Tb9.Name  then return Tbl9UID
      else  return ''

I can do it with case when   statement . But what I am not clear  is   how I can do it when I have to use a left outer join
 it needs to come as one of the multiple  left join for the reasons of another question I asked here
Sam OZAsked:
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slightwv (䄆 Netminder) Commented:
I don't see how returning a column value relates to how you join your tables.

Can you show us with sample data and expected results?

The column value should be something like:
case when  Tbl1.Fld1 in ( 1,2,3)  and ( fld1 ||  fld2 = Tb9.Name or fld1 = Tb9.Name  then Tbl9UID end

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Query Syntax

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