SQL condition sum from two joined tables - sql

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

Answer 2

Try with this:
With tbl3 (Amt,Gold,Silver)
as
(
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 Right JOIN Detail D ON I.InvId = D.InvId
WHERE I.Name = 'John' Group by D.InvId, I.Amount
)
Select SUM(Amt) as Total_Invoice_Amount_For_John,
SUM(Gold) as Total_Silver_Weight,
SUM(Silver) as Total_Gold_Width from tbl3
SQL Fiddle

Answer 3

I havent tried out the other queries already posted and they might already be suitable for what you want but here's my take on it :-
SELECT X.NAME, X.METALTYPE, X.WEIGHT, Y.TOTAL
FROM
(SELECT NAME, METALTYPE, SUM(Weight) AS WEIGHT
FROM INVOICE i
INNER JOIN DETAIL d ON i.InvId = d.InvId
GROUP BY NAME, METALTYPE) X
INNER JOIN
(SELECT SUM(AMOUNT) AS Total, NAME
FROM INVOICE
GROUP BY NAME)Y
ON X.NAME = Y.NAME
ORDER BY NAME, TOTAL, METALTYPE

Answer 4

select name, sum(Amount) as 'total invoice',sum(Gold) as 'Gold',sum(Silver) as Silver from(
select aa.Name,aa.Amount,
sum(case when bb.MetalType='Gold' then bb.Weight else 0 end) as 'Gold',
sum(case when bb.MetalType='Silver' then bb.Weight else 0 end) as 'Silver'
from a aa left outer join b bb on aa.InvID=bb.InvID group by aa.InvID) as c group by c.name