MS Access. Tables: Sub-classing Entities [one to one example]

12 Aug

Via Scoop.itMicrosoft Access

When you’re creating a data model, you often have to deal with differing types of the same basic entity. For example, Customers might be companies or individuals, and you need to store different information for each. Products often have different types, as well. You probably don’t need to store the same information about a book as you do about a piece of software. Books might have the attributes Title, one or more Authors, a Publisher, a Publication Date, a List Price, and a Selling Price. Software, on the other hand, has a Version Number, but no Authors, and you may not care about the Publication Date.
Show original

Leave a comment

Posted by on August 12, 2011 in 1


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: