Design Principles

Table of Contents

Design Principles

Design Principles

Design Principles (II)

Design Principles (III)

Example: Good

Example: Bad

Example: BadNeedless Intermediate

Question:

A Design Problem

A Design Problem (II)

Uniqueness assumptions:

Uniqueness assumptions: (II)

Another Design Problem

Another Design Problem (II)

A station has a name (assumed unique) and an address.

Strawman: What’s Wrong With This?

In the Beginning . . .

In the Beginning . . .(II)

Many-one Example

Network Model

Network Model (II)

Network Model (III)

Hierarchical Model

Hierarchical Model (II)

Typical Bar Record

Typical Bar Record (II)

Example

Where Hierarchical Model Wins

Typical stored records

Email: burt@umbc

Home Page: www.cs.umbc.edu/~burt