Hi Antony, tough day with me no?
You not need a join to get the id of any of the related tables, but if
you need only the top-table data, you only need one join, not n (you can
look the diagrams)
Greetings.
El 05/07/16 a las 11:33, Anthony escribió:
On Tuesday, July 5, 2016 at 11:23:36 AM UTC-4, Carlos Cesar Caballero
wrote:
Hi Marlysson, thanks for your answer, yes maybe I must be more
concise.
In a clasic identifyng relationship, lets say a relation
author-book-page (author has books and books has pages) In this
case, the book primary key includes the author id, and the page
primary key includes the book primary key (author and book ids).
One of the advantages of the identifyng relationship model is that
I can known what book belongs page without need a join, that can
be useful when we have a deep relation tree.
Can you show an example of the table definitions that would allow you
to get the related data without a join?
Anthony
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