Provide relational algebra expressions for the following queriesS EXERCISE CUSTOMER (ID, Type, Firstname, Lastname, Address, City) INVENTORY (ID, ItemName, Type, MadeInStore, SupplierName, ORDERS (ID, Customer_FK, Item_FK, Quantity, DeliveryDate) 1. Find the best and worst selling products DailyAverageSold, Price) -Best products sell more than 30 units on average, daily Worst product sell 10 units or less on average, daily - Show attributes: item id, item name, daily average sold Find average selling products , ordered by the average 2. number of units sold Average products sell between 10 and 30 units, inclusive, per day on average - Show attributes: item id, item name, daily average sold