Read our blogs, tips and tutorials
Try our exercises or test your skills
Watch our tutorial videos or shorts
Take a self-paced course
Read our recent newsletters
License our courseware
Book expert consultancy
Buy our publications
Get help in using our site
547 attributed reviews in the last 3 years
Refreshingly small course sizes
Outstandingly good courseware
Whizzy online classrooms
Wise Owl trainers only (no freelancers)
Almost no cancellations
We have genuine integrity
We invoice after training
Review 30+ years of Wise Owl
View our top 100 clients
Search our website
We also send out useful tips in a monthly email newsletter ...
Software ==> | SQL (203 exercises) |
Topic ==> | Basic joins (12 exercises) |
Level ==> | Average difficulty |
Subject ==> | SQL training |
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.
If you haven't already done so, run the script in the folder above to generate the Doctor Who database.
Each episode in the database has assigned to it the doctor who played the starring role:
Each episode is linked to a doctor by the DoctorId column.
Create a join to list out all of the doctors who appeared in episodes made in 2010. As a help, here's the syntax of an inner join:
-- the syntax of a join
SELECT
-- show columns from either the first table ...
alias1.SomeColumn,
-- ... or the second
alias2.AnotherColumn
FROM
-- decide which will be the main table
FirstTable as alias1
-- link to the second table
INNER JOIN SecondTable as alias2
ON alias1.ColumnName1 = alias2.ColumnName2
Use the year function on the EpisodeDate column to get the year in which each episode took place.
When you run your query, you should see that all but one of the 15 episodes made in this year starred Matt Smith:
They were both better than Peter Capaldi, that's for sure ...
Save your query as David and Matt, then close it down.
You can find other training resources for the subject of this exercise here:
Kingsmoor House
Railway Street
GLOSSOP
SK13 2AA
Landmark Offices
99 Bishopsgate
LONDON
EC2M 3XD
Holiday Inn
25 Aytoun Street
MANCHESTER
M1 3AE
© Wise Owl Business Solutions Ltd 2024. All Rights Reserved.