Fisseha Berhane, PhD

Data Scientist

443-970-2353 fisseha@jhu.edu CV Resume Linkedin GitHub twitter twitter

Using Set Operators

This post is lab exercise I did on Querying with Transact-SQL edx course.

In this lab, I will use set operators to combine the results of multiple queries in the AdventureWorksLT database.

Retrieve Customer Addresses

  • Retrieve billing addresses
    Write a query that retrieves the company name, first line of the street address, city, and a column named AddressType with the value ‘Billing’ for customers where the address type in the SalesLT.CustomerAddress table is ‘Main Office’.
In [ ]:
SELECT c.CompanyName, a.AddressLine1, a.City, 'Billing' AS AddressType
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Main Office';
  • Retrieve shipping addresses
    Write a similar query that retrieves the company name, first line of the street address, city, and a column named AddressType with the value ‘Shipping’ for customers where the address type in the SalesLT.CustomerAddress table is ‘Shipping’.
In [ ]:
SELECT c.CompanyName, a.AddressLine1, a.City, 'Shipping' AS AddressType
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Shipping';
  • Combine billing and shipping addresses
    Combine the results returned by the two queries to create a list of all customer addresses that is sorted by company name and then address type.
In [ ]:
SELECT c.CompanyName, a.AddressLine1, a.City, 'Billing' AS AddressType
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Main Office'
UNION ALL
SELECT c.CompanyName, a.AddressLine1, a.City, 'Shipping' AS AddressType
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Shipping'
ORDER BY c.CompanyName, AddressType;

Filter Customer Addresses

  • Retrieve customers with only a main office address
    Write a query that returns the company name of each company that appears in a table of customers with a ‘Main Office’ address, but not in a table of customers with a ‘Shipping’ address.
In [ ]:
SELECT c.CompanyName
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Main Office'
EXCEPT
SELECT c.CompanyName
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Shipping'
ORDER BY c.CompanyName;
  • Retrieve only customers with both a main office address and a shipping address
    Write a query that returns the company name of each company that appears in a table of customers with a ‘Main Office’ address, and also in a table of customers with a ‘Shipping’ address.
In [ ]:
SELECT c.CompanyName
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Main Office'
INTERSECT
SELECT c.CompanyName
FROM SalesLT.Customer AS c
JOIN SalesLT.CustomerAddress AS ca
ON c.CustomerID = ca.CustomerID
JOIN SalesLT.Address AS a
ON ca.AddressID = a.AddressID
WHERE ca.AddressType = 'Shipping'
ORDER BY c.CompanyName;




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