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I am trying to use this syntax to no avail: [code=sql]SELECT C_Name, ORDERS.O_ID, SUM(ITEM_ORDERED.QUANTITY*PRODUCT.P_PRICE) AS TOTAL_PRICE FROM CUSTOMER, ORDERS, ITEM_ORDERED, PRODUCT WHERE CUSTOMER.C_ID=ORDERS.C_ID AND ORDERS.O_ID=ITEM_ORDERED.O_ID AND ITEM_ORDERED.P_ID=PRODUCT.P_ID GROUP BY ORDERS.O_ID;[/code] My 4 tables would look like this: [U]customer[/U] [U]order[/U] [U]item_ordered[/U] [U]Product[/U] PK C_ID PK O_ID PK,FK O_ID PK P_ID C_Name … |