Fisseha Berhane, PhD

Data Scientist

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

Introduction to Transact-SQL

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

In this lab, I will use some basic SELECT queries to retrieve data from the AdventureWorksLT database.

Retrieve Customer Data

Adventure Works Cycles sells directly to retailers, who then sell products to consumers. Each retailer that is an Adventure Works customer has provided a named contact for all communication from Adventure Works. The sales manager at Adventure Works has asked you to generate some reports containing details of the company’s customers to support a direct sales campaign.

  • Create a list of all customer contact names that includes the title, first name, middle name (if any), last name, and suffix (if any) of all customers.
In [ ]:
SELECT Title, FirstName, MiddleName, LastName, Suffix
FROM SalesLT.Customer;
  • Each customer has an assigned salesperson. You must write a query to create a call sheet that lists: . The salesperson
    . A column named CustomerName that displays how the customer contact should be greeted (for example, “Mr Smith”)
    . The customer’s phone number.
In [ ]:
SELECT Salesperson, Title + ' ' + LastName AS CustomerName, Phone
FROM SalesLT.Customer;

Retrieve Customer and Sales Data

  • Retrieve a list of customer companies in the format Customer ID: Company Name - for example, 78: Preferred Bikes.
In [ ]:
SELECT CAST(CustomerID AS varchar) + ': ' + CompanyName AS CustomerCompany
FROM SalesLT.Customer;
  • The SalesLT.SalesOrderHeader table contains records of sales orders. You have been asked to retrieve data for a report that shows:
    .The sales order number and revision number in the format Order Number (Revision) – for example SO71774 (2).
    •The order date converted to ANSI standard format (yyyy.mm.dd – for example 2015.01.31).
In [ ]:
SELECT SalesOrderNumber + ' (' + STR(RevisionNumber, 1) + ')' AS OrderRevision,
CONVERT(nvarchar(30), OrderDate, 102) AS OrderDate
FROM SalesLT.SalesOrderHeader;

Retrieve Customer Contact Details

  • Retrieve customer contact names with middle names if known
    .You have been asked to write a query that returns a list of customer names. The list must consist of a single field in the format first name last name> (for example Keith Harris) if the middle name is unknown, or first name middle name last name (for example Jane M. Gates) if a middle name is stored in the database.
In [ ]:
SELECT FirstName + ' ' + ISNULL(MiddleName + ' ', '')+ LastName AS CustomerName
FROM SalesLT.Customer;
  • Customers may provide adventure Works with an email address, a phone number, or both. If an email address is available, then it should be used as the primary contact method; if not, then the phone number should be used. You must write a query that returns a list of customer IDs in one column, and a second column named PrimaryContact that contains the email address if known, and otherwise the phone number.
In [ ]:
SELECT CustomerID, COALESCE(EmailAddress, Phone) AS PrimaryContact
FROM SalesLT.Customer;
  • You have been asked to create a query that returns a list of sales order IDs and order dates with a column named ShippingStatus that contains the text “Shipped” for orders with a known ship date, and “Awaiting Shipment” for orders with no ship date.
In [ ]:
SELECT SalesOrderID, OrderDate,
    CASE
      WHEN ShipDate IS NULL THEN 'Awaiting Shipment'
      ELSE 'Shipped'
    END AS ShippingStatus
FROM SalesLT.SalesOrderHeader;




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