Relational Algebra and Calculas. Chapter 4, Part A. Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: Strong formal foundation based on logic. Allows for much optimization.
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Chapter 4, Part A
Two mathematical Query Languages form the basis for “real” languages (e.g. SQL), and for implementation:
Chapter 4, Part B