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Software ==>	SQL (203 exercises)
Topic ==>	Scalar functions (9 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Create all sorts of scalar functions in SQL to return info about Dr Who episodes from within a query

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.

See how many of the following functions you can create in the time left to you!

-- show all these functions working

SELECT

EpisodeId,

Title,

-- function to count number of companions for a given episode

dbo.fnNumberCompanions(EpisodeId) AS Companions,

-- function to count the number of enemies for an episode

dbo.fnNumberEnemies(EpisodeId) AS Enemies,

-- function to count the number of words (hint: use a combination

-- of LTRIM and RTRIM to remove leading and trailing spaces, then

-- REPLACE to change all spaces to empty strings and compare the

-- LEN of the string before and after this change!)

dbo.fnWords(Title) AS Words

FROM

tblEpisode

ORDER BY

Words DESC

Here's what you should see when you run the query, if you manage to create all of the functions listed:

The episodes ordered by number of words

Four episodes have 7 words each.

When (if?) you finish, optionally save your query as Too many functions.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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