This page has 1 thread | Add post

Exercises

Finding our exercises useful? Please consider helping us to share more!

Software ==>	SQL (129 exercises)
Topic ==>	Temporary tables and table variables (9 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Use a table variable to join one set of data to another table

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. Once you've done this:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

The aim of this exercise is to create a table variable to store a list of "odd" countries, then join this to the events table to see events that occurred in those odd countries.

For the purposes of this exercise, an "odd" country is one whose country id is an odd number!

Start by selecting the odd countries.

Select statement returning values using modulus

The easiest way to find the odd countries is to use the modulus operator on the CountryID. In the WHERE clause divide it by 2, but using % instead of /. If the result isn't 0, then it must be odd!

This returns 22 countries. Create a table variable called @OddCountries to hold 2 columns - OddName and OddNumber - and insert these countries into this table in your SQL:

Here the results have been re-ordered as it felt odd-ly satisfying. Not punny?

Join this table to the tblEvent table. Add two criteria to the WHERE clause:

Criteria	Details
Remove self-references	Don't show events whose names contain the country they occurred in.
Co-terminosity	Only show events where the event name and the OddName end in the same letter.

You should see 14 results, some of which are shown below:

RIGHT used in where to filter table variable

Use the RIGHT function to match the last letters.

Optionally save this as Odd requests.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:

This page has 1 thread

Add a new post

From:	ShukiMolk
When:	04 May 20 at 17:43

Reply to ShukiMolk

As far as I'm concerned, these word-plays are VARyCHARming and I consider them a pundamental part of your site.
I wouldn't have it any odder way.

From:	Andy B
When:	05 May 20 at 09:44

Reply to Andy B

Thanks - we do our best!

Add a new post

Book any course as classroom, onsite or online training, or as one-to-one consultancy

Free resources

Paid services

Getting help

Where we are

Where you are

Online

Transparent reviews

Delivery of courses

Nicer to work with

Reliable and established

Our training courses

C#

Excel

MySQL

Power Apps

Power Automate

Power BI and DAX

Python

Report Builder

SQL

SQL Server

VBA Macros

Other training resources

Blogs

Exercises

YouTube tutorials

YouTube shorts

Test your skills

Consultancy

Courseware

Self-paced courses

Newsletters

Publications

Our training venues

London

Manchester

Across the UK

At your site

Online

Why we are different

Hundreds of published reviews

Small class sizes

Outstanding courseware

Online classroom

(Almost) no cancellations

Wise Owl trainers only

Genuine integrity

Invoices after training

30+ years of Wise Owl

Our top 100 clients

EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Use a table variable to join one set of data to another table

Head office

London

Manchester