Tutorial 5 Multi-table queries

Tutorial 5 objectives Displaying Data from Multiple Tables –[ ]Write SELECT statements to access data from more than one table using equality and non-equality joins

Using Northwind… 1.Show the product Id, the product name, the category id and the category name. 2.Show the customerID, company name and OrderId of all customers who have orders. 3.Show the customer’s CompanyName and the first and last name of any employee who has filled an order for that customer. 4.Repeat 3 using the ‘distinct’ keyword straight after the word select. Note the difference in the number of rows. 5.Show the companyname and the name of each product the customer has ordered. 6.Repeat 5, ordering the result by companyname and productname. 7.Repeat 6, using the ‘distinct’ keyword.

Northwind data model

Testing the joins select customers.customerId, CompanyName, orderId from customers left join orders on customers.customerID=orders.customerID where orders.customerID is null