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Chapter 4

Chapter 4. An Introduction to SQL. History of SQL. Developed by IBM in 1970s Early prototype of DB2 called System R Current version is SQL:1999 All major database vendors support SQL All support a superset of a subset of SQL Both relvar and relation = table in SQL Tuple = row in SQL

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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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Chapter 4

Chapter 9