March 2003
Beginner
672 pages
14h
English
book
Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
by Michael J. Hernandez
Content preview from Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
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Categories of Business Rules
It will be easier for you to understand and define business rules if you divide them into two distinct categories: field specific and relationship specific.
Field Specific Business Rules
Business rules under this category impose constraints on the elements of a field specification for a particular field. The number of elements a given rule affects depends on the manner in which you define that rule. For example, this rule only affects one element:
Order dates are to be displayed in long form, such as “January 10, 2003.”
This rule affects the Display Format element of the ORDER DATE field in an ORDERS table. You establish this rule by modifying the Display Format element of the field specifications for the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.