Question

I have two tables as below:

Invoice

InvId | Amount  | Name
-----------------------
1     | 50      | John
2     | 30      | Mike
3     | 20      | John

Detail

MetalType| Weight | InvId
-------------------------
Gold     | 2      | 2
Silver   | 4      | 3
Silver   | 3      | 3
Gold     | 5      | 1

I would like to have the following output, but my query will only provide the total for silver and gold for John. How can I build a query that will also include the total invoice amount for John.

Total Invoice Amount For John = 70
Total Silver Weight = 7
total Gold Weith = 5

SELECT
SUM(IFF(D.MetalType=”Gold”, D.Weight, 0)) AS TotGold,
SUM((IFF(D.MetalType=”Silver”, D.Weight, 0)) AS TotSilver
FROM Invoice I INNER JOIN Detail D ON I.InvId = D.InvId WHERE I.Name = “John”   

Answer 1

Try this:

For Sql-Server:

SELECT 
SUM(TotalAmount) AS TotalAmount,
SUM(TotGold) AS TotGold,
SUM(TotSilver) AS TotSilver
FROM(
SELECT
SUM (I.Amount) OVER (Partition by D.Invid) AS TotalAmount,
SUM(CASE WHEN D.MetalType='Gold' THEN D.Weight ELSE 0 END) AS TotGold,
SUM(CASE WHEN D.MetalType='Silver' THEN D.Weight ELSE 0 END) AS TotSilver
FROM Invoice I INNER JOIN Detail D ON I.InvId = D.InvId

WHERE I.Name = 'John'
GROUP BY D.InvId, I.Amount) n

Here is an SQL Fiddle – now it kills the duplicate detail and counts it only once.

EDITED for Access:

SELECT
  n.Name,
  MAX(TotalAmount),
  SUM(TotGold) AS TotGold,
  SUM(TotSilver) AS TotSilver
FROM(
  SELECT
   I.Name,
   SUM(CASE WHEN D.MetalType='Gold' THEN D.Weight ELSE 0 END) AS TotGold,
   SUM(CASE WHEN D.MetalType='Silver' THEN D.Weight ELSE 0 END) AS TotSilver
  FROM Invoice I 
  INNER JOIN Detail D ON I.InvId = D.InvId
  GROUP BY I.Name, D.InvId, I.Amount) n
INNER JOIN (
   SELECT
     I.Name, SUM (I.Amount) AS TotalAmount
    FROM Invoice I
    GROUP BY I.Name) m ON m.Name = n.Name
GROUP BY n.Name