| From: | "JAMES" <harleyip(at)hotmail(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Query problem |
| Date: | 2000-12-07 12:50:15 |
| Message-ID: | 90o10u$da12@imsp212.netvigator.com |
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| Thread: | |
| Lists: | pgsql-general |
I have 3 tables, I want to show current stock quantity for each item.
Table item
<item_id> <item_name> <cost>
<selling_price>
P001 A4 Paper 10 12
P002 Pen 2
3
P003 Eraser 1 2
P004 Book 20 25
Table stock_out
<item_id> <qty> <date>
P001 4 11-NOV-00
P002 2 02-NOV-00
Table stock_in
<item_id> <qty> <date>
P001 10 01-OCT-00
P002 10 01-AUG-00
P003 10 01-JUL-00
P004 10 01-AUG-00
How can I show the following result?
<item_id> <qty>
P001 6
P002 8
P003 10
P004 10
THANKS
James
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