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 ...
Use inner joins to link four tables to show Dr Who enemies by author.
USE DoctorWho
select a.AuthorId,a.AuthorName,
b.Title,b.episodetype,
c.EnemyId, d.EnemyName
from tblAuthor as a
inner join tblEpisode as b on
a.AuthorId = b.AuthorId
inner join tblEpisodeEnemy as c on
c.EpisodeId = b.EpisodeId
inner join tblEnemy as d on
d.EnemyId = c.EnemyId
where d.EnemyName = 'Daleks'
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.