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Software ==>	SQL (203 exercises)
Topic ==>	Temporary tables and table variables (13 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use a temporary table in SQL Server to store a list of concerts cancelled due to COVID.

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/

In a new script, write a query to return every column from the Show table where the Cancellation_reason column mentions covid.

A list of cancelled concerts produced by a SQL query in SQL Server.

Some of the results you should see.

Use the SELECT INTO syntax to store the results of the query in a temporary table called #CovidCancellations.

A temporary table in the Object Explorer in SQL Server Management Studio

You can find the table in the tempdb database.

If you execute the script again, you'll receive an error because the table already exists. Add an instruction to drop the #CovidCancellations table if it exists at the start of the script.

An error message in SQL Server Management Studio

Make sure this message doesn't appear when you run the script multiple times.

Write a SELECT statement using the temporary table to give the result shown below:

Results of the COUNT function in a SQL Server query.

You can use the CONCAT and COUNT functions to create this result.

Write another SELECT statement which joins the temporary table to the Venue table. Group the rows by venue and count how many shows were cancelled at each. Present the results in descending order of the count of shows.

Results of a GROUP BY query in SQL Server

The first few results you should see.

Write another SELECT statement which joins the temporary table to the Tour and Artist tables. Apply grouping and display the top three artists with the most shows.