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Spatial SQL: A Query and Presentation Language
Spatial SQL: A Query and Presentation Language

... The concept of the display environment The query result is rendered according the display description Offers instructions to SET or CANCEL a ...
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... perform constraint checking such as verifying that data values have been taken from an approved list of values or controlled vocabulary, that numeric data fall in the correct range, or that a specific cell has not been left blank; but in practice this is not often done. Furthermore, while advanced f ...
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Relational model



The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.
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