Relational Algebra. Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Query Languages != programming languages! QLs not expected to be â€œTuring completeâ€. QLs not intended to be used for complex calculations.
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Remark: There are new developments (e.g. SQL3) with the goal: SQL=PL
Two mathematical Query Languages form the basis for “real” languages (e.g. SQL), and for implementation:
Remark: Only relational algebra will be covered in COSC 3480