workbench-en.a4
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Docum<strong>en</strong>ting the sakila Database<br />
As the connection lines show, each table is related to at least one other table in the database (with the exception of the film_text<br />
table). Some tables have two foreign keys that relate to the same table. For example the film table has two foreign keys that relate<br />
to the language table, namely fk_film_language_original and fk_film_language. Where there is more than one<br />
relationship betwe<strong>en</strong> two tables, the connection lines run concurr<strong>en</strong>tly.<br />
Id<strong>en</strong>tifying and non-id<strong>en</strong>tifying relationships are indicated by solid and brok<strong>en</strong> lines respectively. For example, the foreign key<br />
category_id is part of the primary key in the film_category table so its relationship to the category table is drawn with<br />
a solid line. On the other hand, in the city table, the foreign key, country_id, is not part of the primary key so the connection<br />
uses a brok<strong>en</strong> line.<br />
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