Relational calculus. Query processing and optimization. Transaction processing: failure, recovery, and concurrency. Database security. Logic-based systems. Parallel ...

Relational databases and SQL were invented in the 1970s, but still dominate the data world today. Why? Relational calculus, consistent data, logical data representation are all reasons that a ...

The rules for combining and manipulating relations; for example De Morgan's law, "the complement of a union is equal to the union of the complements." THIS DEFINITION IS FOR PERSONAL USE ONLY. All ...