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Added by LACubico on 25 Sep 2018 at 15:35

Use inner joins to link four tables to show Dr Who enemies by author.

USE DoctorWho
select a.AuthorId,a.AuthorName,
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'