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Software ==>	SQL (203 exercises)
Topic ==>	Setting criteria using WHERE (12 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Write SQL queries using the WHERE clause to test for the existence of NULL in a list of music albums.

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 fields from the Album table:

A list of music albums produced by a SQL query

We've sorted the list alphabetically by Title.

Modify the query to return albums which didn't appear in the US Billboard 200 chart - that is, albums whose US_Billboard_200_peak position is NULL.

Results of a SQL query where a field is null.

It's reasonable to assume that if an album doesn't appear in the weekly chart, it doesn't appear in the year end chart.

Write a query in the same script to show albums which appeared in any position the US Billboard 200 chart but which didn't appear in the US Billboard 200 year end chart.

A list of SQL query results using a WHERE clause to test for null and not null values.

The album should have a value for the peak chart position but no value for the year end chart position.

Write another query to return albums which had a peak chart position of 1 but which didn't appear in the year end chart.

A list of number 1 albums produced by a SQL query testing for null.

The first few results you should see if you sort the albums alphabetically.

Write another query to return albums which reached number 1 in the weekly chart but which were outside the top 10 in the year end chart. See the image below for a hint about which results you should see.