SQL | Transactions exercise | Update table, then undo changes with a transaction

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.

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Transactions  (5 exercises)
Level ==> Average difficulty
Subject ==> SQL training
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script 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).

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Use an UPDATE statement on the tblCountry table to set the CountryName column to include the words (My Country) next to the country you call home:

Update Transaction Commit Rollback

Just saying....

Now change the code to add (Holiday destination) to the other countries within a transaction. After running the update statement:

  • roll back the transaction if 1 + 1 = 2 (it does); or
  • commit it otherwise.

When you run this query, nothing should change:

Begin Transaction Commit Rollback

When excluding your country remember to use wild cards to account for the changed name!

Change the condition to test whether 1 + 1 = 3 (it doesn't), and rerun it.  Check that the extra text has been added:

Commit transaction and update table

If you have nothing better to do, change Holiday to Visited for countries you've been to.

Finally, as a bit of housekeeping please reset the country names by running this query:

-- reset country names

UPDATE tblCountry

SET CountryName = REPLACE(CountryName,

' (Holiday Destination)','')

-- check this worked

SELECT * FROM tblCountry

If you could also manually reset the name of your home country back to its former glory, that would be good!  Thanking you ...

Optionally save this as Stake your claims.sql, and then 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.
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