Full join in two columns with repeated values - sql

Question

I have two tables that look like this:
sMinMax:
PartNo baseID Min Max
11795 1 1 1
11795 5 0 0
11795 6 1 1
01655 65 2 3
vsStock:
PartNo baseID Qty
11795 1 1
11795 1 1
11795 55 1
I would like to join them so I get a table that shows all the columns together for all the parNo en bases like this:
result:
PartNo baseID Min Max Qty
11795 1 1 1 2
11795 5 0 0 null
11795 6 1 1 null
11795 55 null null 1
01655 65 2 3 null
So I would just do this with a full outer join on two columns but this gives the same results that I would expect from a left join. I tried 1000 things but this is my last try:
SELECT
a.sPart_ID
,a.uRALBase_ID
,a.MinQty
,a.MaxQty
,b.Qty
FROM [RALNHVTST].[dbo].[sMinMax] as a
FULL OUTER JOIN [RALNHVTST].[dbo].[vsStockList] as b
ON a.sPart_ID = b.sPart_ID
AND a.uRALBase_ID = b.uRALBase_ID
WHERE a.sPart_ID IS NOT NULL
AND a.sPart_ID = 1159
ORDER BY a.sPart_ID
but as I said this gives me the same results as a LEFT JOIN. Anyone have an idea what I'm doing wrong?

Answer 1

Something like that? This query gives me same result as you expected.
SELECT
CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END AS PartNo
,CASE WHEN a.baseId IS NOT NULL THEN a.baseId ELSE b.baseId END AS baseId
,a.[Min]
,a.[Max]
,SUM(b.Qty) AS Qty
FROM [dbo].[sMinMax] as a
FULL JOIN [dbo].[vsStock] as b
ON a.partNo = b.partNo
AND a.baseId = b.baseId
GROUP BY
CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END,
CASE WHEN a.baseId IS NOT NULL THEN a.baseId ELSE b.baseId END,
a.[Min],
a.[Max]
ORDER BY
CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END

Answer 2

Filtering in a full join is tricky. I would recommend filtering and aggregating in subqueries:
SELECT COALESCE(sm.sPart_ID, s.sPart_Id) as sPartId,
COALESCE(sm.uRALBase_ID, sm.uRALBase_ID
sm.MinQty, sm.MaxQty, s.Qty
FROM (SELECT sm.*
FROM [RALNHVTST].[dbo].[sMinMax] sm
WHERE sm.sPart_ID = 1159
) sm FULL OUTER JOIN
(SELECT s.sPart_ID, s.uRALBase_ID, SUM(qty) as qty
FROM [RALNHVTST].[dbo].[vsStockList] s
WHERE s.sPart_ID = 1159
GROUP BY s.sPart_ID, s.uRALBase_ID
) s
ON sm.sPart_ID = s.sPart_ID AND
sm.uRALBase_ID = s.uRALBase_ID
ORDER BY sPart_ID