'Unmatched foreign key values' presentation slideshows

Chapter 9

Chapter 9. Integrity. Topics in this Chapter. Predicates and Propositions Internal vs. External Predicates Correctness vs. Consistency A Constraint Classification Scheme Keys Triggers SQL Facilities. Integrity. Correctness Currency Completeness Validity--does it make sense?

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Integrity

Integrity. Keys. Candidate Keys. K: a set of attributes of relvar R K is a candidate key for R iff Uniqueness No legal values of R contain two distinct tuples with the same value of K Irreducibility(minimality) No proper subset of k has the uniqueness Syntax

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