Summing column values from 2 tables and getting their difference - ms-access

Question

I have 2 tables, ord_tbl and pay_tbl with these data:
ord_tbl
invoice | emp_id | prod_id | amount
123 | 101 | 1 | 1000
123 | 101 | 2 | 500
123 | 101 | 3 | 500
124 | 101 | 2 | 300
125 | 102 | 3 | 200
pay_tbl
invoice | new_invoice | amount
123 | 321 | 300
123 | 322 | 200
124 | 323 | 300
125 | 324 | 100
I would like the selection statement to give me this result
invoice | emp_id | orig_amt | balance | status
123 | 101 | 2000 | 1500 | unsettled
The invoice that has 0 balance will not be included anymore. This is what I tried so far...
;WITH CTE as
(SELECT ot.invoice, MAX(ot.emp_id) as emp_id, SUM(ot.amount) as origAmt FROM ord_tbl ot GROUP BY ot.invoice),
CTE2 as
(SELECT pt.invoice, SUM(pt.amountt) as payAmt FROM pay_tbl GROUP BY pt.invoice)
SELECT CTE.invoice, CTE.emp_id, CTE.origAmt, CTE.origAmt-CTE2.payAmt as bal, 'UNSETTLED' as status
FROM
CTE LEFT JOIN CTE2 ON CTE.invoice=CTE2.invoice
WHERE CTE.emp_id='101' AND CTE.origAmt-CTE2.payAmt>0 OR CTE2.patAmt IS NULL
This has been taught to me here and it works in sql server. What I need now is to have this run in ms access. I tried this code but ms access gives me an error saying "Invalid SQL statement; expected 'DELETE','INSERT', 'SELECT', or 'UPDATE'."
Can you help? Thanks.

Answer 1

MS ACCESS sql is poor and ACCESS doesn't know WITH instruction. I created tables (all fields int type). I rewrote query and this query works:
SELECT CTE.invoiceCTE,
CTE.emp_idCTE,
CTE.origAmtCTE,
CTE.origAmtCTE-CTE2.payAmtCTE2 as bal,
'UNSETTLED' as status
FROM
(SELECT invoice as invoiceCTE,
MAX(emp_id) as emp_idCTE,
SUM(amount) as origAmtCTE
FROM ord_tbl
GROUP BY invoice) as CTE
LEFT JOIN
( SELECT invoice as invoiceCTE2,
SUM(amount) as payAmtCTE2
FROM pay_tbl
GROUP BY invoice) as CTE2
ON CTE.invoiceCTE=CTE2.invoiceCTE2
WHERE CTE.emp_idCTE=101
AND (CTE.origAmtCTE-CTE2.payAmtCTE2>0 OR CTE2.payAmtCTE2 IS NULL)

Answer 2

I don't know about emp_id. If it is some kind of customer id you'd have only one per invoice_id and you'd need this SQL:
SELECT
ord_tbl.invoice,
First(ord_tbl.emp_id) AS ErsterWertvonemp_id,
Sum(ord_tbl.amount) AS origAmt,
Sum([ord_tbl].[amount])-Sum([pay_tbl].[amount]) AS bal,
"unsettled" AS status
FROM
ord_tbl LEFT JOIN pay_tbl
ON ord_tbl.invoice = pay_tbl.invoice
GROUP BY ord_tbl.invoice
HAVING (((Sum([ord_tbl].[amount])-Sum([pay_tbl].[amount]))>0));
If you want to select only the ones with emp_id=101 you'd need this:
SELECT
ord_tbl.invoice,
ord_tbl.emp_id,
Sum(ord_tbl.amount) AS origAmt,
Sum([ord_tbl].[amount])-Sum([pay_tbl].[amount]) AS bal,
"unsettled" AS status
FROM
ord_tbl LEFT JOIN pay_tbl
ON ord_tbl.invoice = pay_tbl.invoice
GROUP BY
ord_tbl.invoice,
ord_tbl.emp_id
HAVING (
((ord_tbl.emp_id)=101)
AND
((Sum([ord_tbl].[amount])-Sum([pay_tbl].[amount]))>0)
);