wikibot
Source
CREATE OR REPLACE VIEW SH.PROFITS AS
SELECT
s.channel_id,
s.cust_id,
s.prod_id,
s.promo_id,
s.time_id,
c.unit_cost,
c.unit_price,
s.amount_sold,
s.quantity_sold,
c.unit_cost * s.quantity_sold TOTAL_COST
FROM costs c, sales s
WHERE c.prod_id = s.prod_id
AND c.time_id = s.time_id
AND c.channel_id = s.channel_id
AND c.promo_id = s.promo_id