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Software ==>	SQL (202 exercises)
Topic ==>	Transactions (6 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Create a transaction, add Shaun the Sheep as a Doctor Who, then commit or roll this back

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 .

First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.

Write a query to add Shaun the Sheep as Doctor Who number 13 in the tblDoctor table, but first begin a transaction:

-- this should go within a transaction

INSERT INTO tblDoctor(

DoctorName,

DoctorNumber

) VALUES (

'Shaun the Sheep',

13

)

Extend this query (without running it yet) so that it:

Tests to see whether 2 + 2 = 4;
Rolls back the transaction if this is true; or
Commits it if this is false.

Use the SQL syntax IF ... ELSE ....

Finally, display a list of all of the doctors (the rows from the tblDoctor table). Now run your query - it should show the original 12 doctors (Shaun the Sheep has not beeen added).

Amend your query to test whether 2 + 2 = 5, and rerun it. You should now get your new doctor:

The new doctor

The transaction has been committed, and the new doctor appears in the list.

Manually delete this added row, then (optionally) save this query as Baad example.sql and close it down.

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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