Keyphrases
- programming language
- null values
- integrity constraints
- relational databases
- normal form
- incomplete information
- query evaluation
- relational algebra
- object oriented
- databases
- functional dependencies
- general purpose
- data dependencies
- high level
- software engineering
- denotational semantics
- strongly typed
- update operations
- logic programming
- predicate logic
- database
- database design
- relational model
- query language
- data model
- database systems
- artificial intelligence
- database applications
- relational calculus
- database languages