Re-write

See What Meaning Means:  Business Rules, Predicates, Constraints and Database Consistency

Re-write

See:

• Data Sublanguage Part 1: Relational vs. Computational Completeness
• Data Sublanguage Part 2: Data Manipulation and Definition
• Data Sublanguage Part 3: DBMS Language
• Data Sublanguage Part 4: Conclusion

 

Re-write

See:

• Understanding Keys: Entity-Defining Properties and Entity Names
• Kinds of Keys: Natural, Primary and Surrogate Are Sufficient
• Surrogate Key Illusions
• Duplicates: Stating the Same Fact More Than Once Does Not Make it Truer, Only Redundant

Re-write

See: Understanding Relations Part 1: Tables? So What?