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

Declare a table variable, and copy the Dr Who companions, enemies and doctors into it

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.

The aim of this exercise is to put all of the Doctors, companions and enemies into a single table variable called @characters. You should then be able to list out this table's rows:

-- show results

SELECT * FROM @characters

ORDER BY CharacterName DESC

This will give the following:

The first "few characters", in reverse alphabetical order. Lots of help is given below!

To start with, create a table containing the following three columns:

Column	Type	Contents
CharacterId	int	The id number of the doctor, companion or enemy
CharacterName	varchar(100)	The name of the doctor, companion or enemy
CharacterType	varchar(100)	Which of the 3 types of character this is

The syntax of how to create a table variable like this is as follows:

-- create a table variable

DECLARE @TableVariableName TABLE(

Column1 Datatype1,

...,

ColumnN DatatypeN

)

Now insert the doctors into this table from the tblDoctor table. The syntax for how to do this is as follows:

-- append rows into existing table

INSERT INTO @TableVariableName(

Column1,

...,

ColumnN

)

SELECT

ColumnOrValue1,

...,

ColumnOrValueN

FROM

TableName

Repeat this twice more to insert the companions and enemies into the table, so that you can run the query shown at the start of this exercise to list out the 109 rows in the @characters table.

Optionally, save your query as Strange bedfellows 2.sql, 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.

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

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