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Exercises

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Software ==>	SQL (203 exercises)
Topic ==>	Calculations (18 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Add basic expressions to an SQL query to calculate new values from existing columns in a table.

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file . If you want to download the SQL Server database that this yields:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (remember to refresh your list of databases to see it!). Note that any files provided are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl.

If you don't have a copy of the Music_01 database, follow the instructions at the following link to create it: www.wiseowl.co.uk/sql/exercises/standard/using-sql-server/5257/

Write a query to return the following columns from the Show table.

The results of a basic SELECT statement showin a list of music shows in SQL Server Management Studio.

We'll calculate new values using these columns.

Add a new column to the SELECT list which subtracts the Tickets_sold column from the Tickets_available column. Apply an alias to your new column to name it Unsold_tickets.

The results of an SQL query with a basic calculated column showing the number of unsold tickets for music shows.

You may need to scroll down to see the first show with unsold tickets.

Add an ORDER BY clause to sort the shows in descending order of unsold tickets. You can use your column alias to do this.

The results of a SQL query sorted using an alias assigned to a calculated column.

That's a lot of unsold tickets!

Add a WHERE clause to return only shows which had at least 10000 unsold tickets.

You won't be able to use your column alias in the WHERE clause so you'll need to repeat the calculation in this part of your query.

Add another calculated column to the same query which divides the Revenue_$ column by the Tickets_sold column. Name this column Avg_ticket_price.

The results of calculated columns in the SELECT list of a SQL query displayed in SQL Server Management Studio.

I'm not sure how accurate these numbers are!

Add another calculated column which multiplies the number of unsold tickets by the average ticket price. You won't be able to refer to your previous calculated columns which means you'll need to repeat both expressions in your new formula. Don't forget to use round brackets to control the order of operations!