1. Rob Gleasure R.Gleasure@ucc.ie robgleasure.com
IS6126 Databases for Management Information Systems Lecture 2: Solution
Rob Gleasure
robgleasure.com

2. Exercise
Consider the following problems related to the Customers database, what queries best solve them?
We want to retrieve all customers with addresses in Mexico?
SELECT * FROM Customers WHERE Country='Mexico';
We want to add a new Customer called 'Juan Garcia Ramos', with contact name 'Juan Ramos', address of 'Tribulete 4356', in the city 'México D.F', with a post code of '05029', in the country of 'Mexico‘?
INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode, Country) VALUES ('Juan Garcia Ramos', 'Juan Ramos','Tribulete 4356', 'México D.F','05029', 'Mexico');
We want to update that customer’s contact name to ‘Anna Ramos’?
UPDATE Customers SET ContactName='Anna Ramos' WHERE CustomerName='Juan Garcia Ramos';
We want to delete the same customer?
DELETE FROM Customers WHERE (CustomerName='Juan Garcia Ramos');

3. Exercise
We want to select ProductName and CategoryID from the Products table, along with the SupplierName from the Suppliers table using a left join. Hint: use the SupplierID column in the Products table as a foreign key
SELECT Products.ProductName, Products.CategoryID, Suppliers.SupplierName FROM Products LEFT JOIN Suppliers ON Products.SupplierID = Suppliers.SupplierID;
We want to retrieve all cities mentioned in customer records and supplier records using a union
SELECT City FROM Customers UNION SELECT City FROM Suppliers;
We want create e new Customer_Cities_Backup table storing all cities listed in the Customers table
SELECT City INTO Customer_Cities_Backup FROM Customers;
We want to add all cities listed in the Suppliers table into the Customers table
INSERT INTO Customers (City) SELECT City FROM Suppliers;