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Software ==>	SQL (203 exercises)
Topic ==>	Transactions (6 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use transactions in SQL to control what happens when you modify data in tables.

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 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/

Open the Soundtrack Transactions.sql file in the folder shown above. You'll find a script to create a new table, insert some rows into it and then select the results.

If you execute the script you'll encounter an error.

An error message caused by an invalid INSERT statement in SQL Server.

One of the INSERT statements isn't working.

The problem is that our Volume column only allows values up to 10 but one of the soundtracks exceeds that limit.

An insert statement in SQL Server

"These go to eleven."

This means that we're left with an incomplete set of records in the table.

Results of a SELECT statement in SQL Server.

A Spinal Gap?

Add a TRY block around the group of INSERT statements in the script.

Add a CATCH block below this which shows the result of the ERROR_MESSAGE() and ERROR_NUMBER() functions.

Results of an error handling statment in SQL Server.

The results you should see after executing the script.

If any of the INSERT statements fail, we'd like to reset the data in the table to the state it was in before we attempted to modify it.

Above the TRY block, begin a new transaction.

Inside the TRY block, choose to COMMIT the transaction when all the INSERT statements have succeeded.

Inside the CATCH block, choose to ROLLBACK the transaction.

An error message displayed in SQL Server.

When you execute the script you should be left with an empty table.

Modify the constraint in the table to allow the Volume column to accept values up to 11.

A check constraint in a table in SQL Server.

"It's one louder."

Execute the script again to see the final results.

Results of a SQL query in SQL Server

Finally, a full set of soundtracks.

Save and close the script.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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