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Software ==>	SQL (129 exercises)
Topic ==>	Table-valued functions (6 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

List episodes made by any given doctor by using a table function in SQL

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.

Create a table-valued function to list out all of the episode details for a given doctor. Here's the syntax, as a reminder:

CREATE FUNCTION FunctionName(

@Parameter1 DataType1,

...,

@ParameterN DataTypeN

)

RETURNS TABLE

-- return data from a single SELECT statement

RETURN

SELECT

ColumnList

FROM

TableName

You should be able to run this query to show the episodes in which anyone called Chris appeared:

-- show the Christopher Eccleston episodes

SELECT * FROM dbo.fnEpisodesByDoctor('Chris')

Here's what this should show:

The first few of the 13 episodes in which Christopher Eccleston appeared.

Create a query based on this (you'll need to give the results returned by the function a table alias, and create a join from this to the tblAuthor table) to show the details (including author) for episodes made by doctors called Chris:

The 13 episodes made by Christopher Eccleston, bringing in the author name from the tblAuthor table.

Optionally, save this query as Episodes by doctor.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

List episodes made by any given doctor by using a table function in SQL

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