Concatenate two columns with different names

Question

I have two tables, joined on one column, I want to concatenate one of the columns with different names into the same column, I have tried this

I want whstocks.warehouse to be concatenated with brnstocks.brachcode .

current result (no 900 brachcode from whstocks)

brachcode | varint | stock
---------------------------
201       |24601121| 2
204       |24601121| 3
197       |24601121| 4

Desired result (bring 900 from whstocks.warehouse into branchcode)

brachcode | varint | stock
---------------------------
201       |24601121| 2
204       |24601121| 3
197       |24601121| 4
900       |24601121| 400

SELECT  brnstocks.branchcode , brnstocks.varint , SUM(brnstocks.retail)
FROM dbo.brnstocks
INNER JOIN dbo.whstocks
ON brnstocks.varint = whstocks.varint
GROUP BY brnstocks.branchcode, whstocks.warehouse
        ,brnstocks.varint
        ,brnstocks.retail
        ,whstocks.stock
HAVING (SUM(brnstocks.retail) > 0)

Answer 1

Try this:

SELECT
    P.branchcode , P.varint , SUM(P.retail)
FROM
(SELECT  
    branchcode , varint , retail
FROM dbo.brnstocks
UNION
SELECT  
    branchcode , varint , retail
FROM dbo.whstocks
) AS P

GROUP BY P.branchcode , P.varint
HAVING (SUM(P.retail) > 0)

Assuming that whstocks has the same fields as brnstocks . If not, substitute the matching fields from whstocks

Answer 2

Since you're already grouping by both, you should be able to concatenate them using the + operator.

SELECT  whstocks.warehouse + brnstocks.branchcode [WarehousePlusBranch], brnstocks.varint , SUM(brnstocks.retail)
FROM dbo.brnstocks
INNER JOIN dbo.whstocks
ON brnstocks.varint = whstocks.varint
GROUP BY brnstocks.branchcode
        ,whstocks.warehouse
        ,brnstocks.varint
        ,brnstocks.retail
        ,whstocks.stock
HAVING (SUM(brnstocks.retail) > 0)