The columns named price and sales_qty are from two different tables, sales_hist as table_1 and unit_price_cost as table_2. Use the following SELECT statement to find which category of items is sold for a profit margin greater than $1000.
SELECT table_1.category, (table_2.price - table_2.cost) * SUM (table_1.sales_qty) AS margin FROM sales_hist AS table_1, unit_price_cost AS table_2 WHERE table_1.prod_no=table_2.prodno GROUP BY table_1.category, table_2.price, table_2.cost HAVING margin > 1000;
A subquery can have a join on a view with an aggregate operation and a HAVING clause that references more than one table.