I want to update a colume using results from an select query but its not working :( my code:

UPDATE goods
SET goods.wagons_needed = (SELECT (goods.QUANTITY * WEIGHT) / max_payload as wneed
ON goods.wagon_type_id = wagon_type.wagon_type_id
order by goods.goods_id)
where goods.goods_id = goods.goods_id;

Thanks for any help.

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What error do you get?

Perhaps because your select can return multiple results? Try LIMIT 1.

give your table structure? It seems your select query is returning multiple record.Try running the select query sepately in your mysql client and check its output.

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