SQL | Transactions exercise | Using Insert, Update and Delete in transacitons

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The answer to the exercise will be included and explained if you attend one of more of the courses listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Transactions  (5 exercises)
Level ==> Average difficulty
Courses ==> Fast-track SQL  /  Advanced SQL
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.

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First store the value of Westeros in a variable. Now write an insert statement to add the value of this variable into the ContinentName field:

INSERT INTO tblContinent (ContinentID,ContinentName)

VALUES (9,@Continent)

Note that to do this you will first need to get SQL Server to overwrite the ContinentId identity column by running the command SET IDENTITY_INSERT tblContinent ON.  Don't forget to turn this property off at the end of your query.

After running the Insert statement, comment it out but leave the variable.

Let a game of thrones begin

You should now see Westeros appearing in the list of continent names when you select them.  The question is: which is the deadliest continent?

Start a TRANSACTION to delete the continent held in the variable, using this syntax:

DELETE tblContinent

WHERE ContinentName = @Continent

If the first letter of your name is not equal to (<>) the first letter of the variable (W) then roll back the transaction:

Transaction deleteing information

In this case, show the message You have died and update the continent name of Westeros to Seven Kingdoms, then select all the continents.

 

Set the ELSE condition to show You have won and to then select all the continents.

 The outcome now will depend on your name. If it is W then you will see no continent:

Congratulations

You survived and the seven kingdoms of Westeros are gone. Danny would be proud!

For those less fortunate of us, you will have died. Change the <> to an = and rerun the script. This time you should see Seven Kingdoms and a happier message.

Delete transaction
 

Optionally save this as Game Of Thrones.sql and close it down.

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