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#1
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Should this be one to Many or Many to Many.. Relationship
Hi,
New to Access learning... I have Table 1.. Publisher Table 2.. Books I was wondering .. Should I create Transient Third Table e.g. BooksPublisher.. Or Should I put PublisherID key AS Foreign key into Books Table ? which would be Practical E.g Books Publishers BooksNPublishers Pk BookID Pk PublisherID PK BookPublisherID Fk BookID Fk PublisherID OR Publishers Books PK PublisherID PK BookID Fk PublisherID Could Somebody guide me Thanks in Advance Ahmed Khalak |
#2
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Should this be one to Many or Many to Many.. Relationship
To answer your question, which of the following do you need to handle:
a) Any book has only ONE publisher. Therefore a foreign key in the Books table would be enough. OR b) A book can have more than one publisher. Therefore you need the junction table. In general (a) is adequate. You look on the back of the title page, and you can discover who the publisher was. In rare cases, a classic book does get republished by a different publisher. If you *must* treat this as the same book (e.g. in a large library system), then you need to use (b). Another aspect you may want to consider is whether your cataloguing system should handle resources other than books (e.g. movies, lecturers on video, music CDs, web pages, ...) If so, you may find it worth thinking through the angles discussed in this article: Library resource example at: http://allenbrowne.com/AppLibrary.html -- Allen Browne - Microsoft MVP. Perth, Western Australia Tips for Access users - http://allenbrowne.com/tips.html Reply to group, rather than allenbrowne at mvps dot org. "Ahmed" wrote in message ... Hi, New to Access learning... I have Table 1.. Publisher Table 2.. Books I was wondering .. Should I create Transient Third Table e.g. BooksPublisher.. Or Should I put PublisherID key AS Foreign key into Books Table ? which would be Practical E.g Books Publishers BooksNPublishers Pk BookID Pk PublisherID PK BookPublisherID Fk BookID Fk PublisherID OR Publishers Books PK PublisherID PK BookID Fk PublisherID Could Somebody guide me Thanks in Advance Ahmed Khalak |
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