Insert Into and multiple union with 3 Tables

Question

I'm using MS-Access. I have a table A looks like :

 id isin    typ1    typ2                                                                                 
 1  aa      typA    typB                                                                                 
 2  bb      typD    typC

a Table C Like:

id  isin   code1   assetName   BBweight
1   aa       x        x           x
2   bb       x        x           x

... .. .. .. ..

I need to insert both tables into table B that looks like:

 ID  isin   fld   fldValue  BBweight   code1  assetName                                                          
 1   aa     typ1     typA       w1       x       x                                                                                 
 2   aa     typ2     typB       w2       x       x                                                                                 
 3   bb     typ1     typD       ...     ...     ...                                                                                 
 4   bb     typ2     typC       ...     ...     ...

What's the SQL string, compatible with MS-Access, that I can use?

This is the string i'm using that doesn't work:

sql = "insert into B (isin, code1, assetName, BBweight, fld, [fldValue]) " _
& "SELECT isin, code1, assetName, BBweight, fld, [fldValue] from " _
& "(select isin, code1, assetName, BBweight from C) " _
& "Union " _
& "(select isin, 'typ1' as fld, typ1 as [fldValue] from A " _
& "Union " _
& "select isin, 'typ2' as fld, typ2 as [fldValue] from A) as R "

Answer 1

Here's a tutorial with vb if you're trying to be fancy with code, but the SQL you're looking for is a JOIN.

SELECT * 
FROM Table A
JOIN Table B on a.id = b.id and a.isin = b.isin

StackOverflow is here to help when you've hit a roadblock , not build it for you; please show us your attempts and your specific issue, with code, after you've tried it a few times.

EDIT :

Thank you for providing your attempt! I see I skipped over a key element of the requirement. You nearly had it; you want to JOIN against your UNION'd statement, not UNION again. This is the clean SQL for it, that you need to put into your VB:

SELECT 
  newTableA.*,
  tableC.code1,
  tableC.assetName,
  tableC.BBWeight
FROM 
    (
      SELECT    isin,    'typ1' as fld,    typ1 as fldValue FROM tableA
      UNION 
      SELECT    isin,    'typ2' as fld,    typ2 as fldValue FROM tableA
    ) newTableA
JOIN TableC on newTableA.isin = TableC.isin

Demo

Answer 2

You can try

insert into B (isin, fld, fldvalue, BBweight, code1, assetName)
select isin, fld, fldvalue, BBweight, code1, assetName from
  (select isin, "typ1" as fld, typ1 as fldvalue from A
  union all
  select isin, "typ2" as fld, typ2 from A) as R
inner join C on R.isin = C.isin
order by R.isin, fld