Table of Contents

Introduction
1. “Inapplicable Data”: Nothing's Missing
2. Missing Data: Into the Unknown
3. SQL NULL: What-Valued Logic?
4. Known Unknowns: Metadata
5. A Relational Solution
5.1. The Practicality of Theory
5.2. A Real World Example
5.3. Relation Proliferation
6. Questions/Comments/Objections
Conclusion