SQL sum and group values from two tables - sql

Question

I'm trying to group sales data based on a sellers' name. The name is available in another table. My tables look like this:
InvoiceRow:
+-----------+----------+-----+----------+
| InvoiceNr | Title | Row | Amount |
+-----------+----------+-----+----------+
| 1 | Chair | 1 | 2000.00 |
| 2 | Sofa | 1 | 1500.00 |
| 2 | Cushion | 2 | 2000.00 |
| 3 | Lamp | 1 | 6500.00 |
| 4 | Table | 1 | -500.00 |
+-----------+----------+-----+----------+
InvoiceHead:
+-----------+----------+------------+
| InvoiceNr | Seller | Date |
+-----------+----------+------------+
| 1 | Adam | 2016-01-01 |
| 2 | Lisa | 2016-01-04 |
| 3 | Adam | 2016-01-08 |
| 4 | Carl | 2016-01-17 |
+-----------+----------+------------+
The query that I'm working with currently looks like this:
SELECT SUM(Amount)
FROM InvoiceRow
WHERE InvoiceNr IN (
SELECT InvoiceNr
FROM InvoiceHead
WHERE Date >= '2016-01-01' AND Date < '2016-02-01'
)
This works and will sum the values of all rows of all invoices (total sales) in the month of january.
What I want to do is a sales summary grouped by each sellers' name. Something like this:
+----------+------------+
| Seller | Amount |
+----------+------------+
| Adam | 8500.00 |
| Lisa | 3500.00 |
| Carl | -500.00 |
+----------+------------+
And after that maybe even grouped by month (but that's not part of this question, I'm hoping to be able to figured that out if I solve this).
I've tried all kinds of joins but I end up with a lot of duplicates, and I'm not sure how to SUM and group at the same time. Does anyone know how to do this?

Answer 1

Try This
SELECT seller, SUM(amount) FROM InvoiceRow
JOIN InvoiceHead
ON InvoiceRow.InvoiceNr = InvoiceHead.InvoiceNr
GROUP BY InvoiceHead.seller;
OR If you want to between two date. Try This
SELECT seller, SUM(amount) FROM InvoiceRow
JOIN InvoiceHead
ON InvoiceRow.InvoiceNr = InvoiceHead.InvoiceNr
WHERE InvoiceHead.Date >= '2016-01-01' AND InvoiceHead.Date < '2016-02-01'
GROUP BY InvoiceHead.seller;

Answer 2

You just need to join the tables, filter result by date as you need and then make grouping:
select
H.Seller,
sum(R.Amount) as Amount
from InvoiceHead as H
left outer join InvoiceRow as R on R.InvoiceNr = H.InvoiceNr
where H. Date >= '2016-01-01' AND H.Date < '2016-02-01'
group by H.Seller

Answer 3

SELECT t.seller,sum(s.amount)
FROM invoiceRow s join InvoiceHead t
ON s.invoiceNr = t.invoiceNr
group by t.seller
You should just sum them up. If date range is necessary, you can add a where clause after the ON clause and filter you dates like this:
SELECT t.seller,sum(s.amount)
FROM invoiceRow s join InvoiceHead t
ON s.invoiceNr = t.invoiceNr
WHERE t.date between '01-01-2016' and '31-01-2016'
group by t.seller

Answer 4

You may try this once:
SELECT ih.Seller,
(
SELECT SUM(Amount) FROM invoicerow ir
INNER JOIN invoicehead ih1
ON (ir.InvoiceNr = ih1.InvoiceNr)
WHERE ih1.Seller = ih.Seller
) AS Amount
FROM invoicehead ih
GROUP BY ih.Seller