Business Rules and Semantic Object Models

What are business rules in relation to a DBMS. Do you have any posssible examples for a university database?

Also: Do you have any hints to drawing a Semantic Object Model for a relationship between A university, its three campuses, donors of funds, students and staff?

Business rules are constraints; they could be things like NOT NULL, or CHECK or RULE, or more exotically, a foreign key. There is a distinction to be made between a business rule that is used to enforce housekeeping versus ensuring referential integrity. What if our rule says that Student SSN cannot be Null. If we are entering student data and SSN is not key and we’re almost done but have no SSN, should the entry be allowed?

My point is that this kind of validity checking may be more profitably spent on the front end, before it gets to the server, where I will enforce the NOT NULL constraint only on my key columns, for example, or failing that, then be sure to declare defaults for all NOT NULL columns.

Possible business rules for a university database may be that: no student can register for less that twelve credits a semester;no student can register for more than thirty credits a semester;tenured faculty members have a choice of a parking space or a train pass but not both.

As to the second question, take a look at Conceptual Schema and Relational Design by Terry Halpin, then go check out Visio Enterprise 5.0

Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may