Hello list. Could you please suggest me a one-line query to solve a problem of inventory ?
Three table: Products ----------------------------- | id | description | ----------------------------- | 01 | bread | | 02 | milk | | 03 | coffee | ----------------------------- Purchases ----------------------------- | prod_id | quantities | ----------------------------- | 01 | 10 | | 02 | 5 | | 03 | 3 | ----------------------------- Sellings ----------------------------- | prod_id | quantities | ----------------------------- | 01 | 3 | | 01 | 1 | | 02 | 1 | | 02 | 1 | ----------------------------- The query should return --------------------------------------------------------------------- | prod_id | description | purchases | sellings | inventory | --------------------------------------------------------------------- | 01 | bread | 10 | 4 | 6 | | 02 | milk | 5 | 2 | 3 | | 03 | coffee | 3 | 0 | 3 | --------------------------------------------------------------------- Thank you very much for your help. Gigi --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
