Keyphrases
- programming language
- formal semantics
- database query languages
- relational data
- logic programming
- relational learning
- data model
- relational calculus
- relational schema
- programming environment
- semantic information
- database schema
- computer programming
- programming course
- operational semantics
- aggregate functions
- programming language constructs
- relational algebra
- default reasoning
- conceptual model
- expressive power
- entity relationship
- general purpose
- algebraic operations
- database