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What is Key Concepts in Relational Databases about?
A relational database consists of a collection of tables, fields, and records. Relational algebra is a fundamental query language used to manipulate the data in relational databases. Some key operations in relational algebra include selection (denoted by the Greek letter sigma), projection, union, set difference, and Cartesian product. Selection filters tuples based on a predicate, with the predicate appearing in the subscript and the relation in parentheses after sigma. Set difference (denoted by the minus
- Author
- Mama Miya
- Language
- EN