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Software ==>	SQL (129 exercises)
Topic ==>	Scalar functions (6 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Use an SQL function within a query to find out the part number of any Dr Who episode

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 create a function called fnEpisodeDescription such that you can count how many episodes there are of each type:

-- count number of episodes of each type

SELECT

dbo.fnEpisodeDescription(Title) AS 'Episode type',

COUNT(*) AS 'Number of episodes'

FROM

tblEpisode

GROUP BY

dbo.fnEpisodeDescription(Title)

Here's what this should return:

It's reassuring to see that the number of first and second parts are the same!

To write this function use the CHARINDEX function to determine whether one string of text exists within another:

Your function should look for the word Part 1 (or failing that, Part 2) in the title passed in.

As a guide, CHARINDEX('owl','Wise Owl') would return 6, whereas CHARINDEX('fox','Wise Owl') would return 0.

When you've got your function and query working, save (optionally) the SQL as Part of a couple.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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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Use an SQL function within a query to find out the part number of any Dr Who episode

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