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SELECT first_name, last_name, salary FROM employees a WHERE
SELECT first_name, last_name, salary FROM employees a WHERE

... Materialized Views • Oracle has an object called a materialized view. It is a view that actually contains data. • Data is updated periodically • Useful for derived data, such as statistical data ...
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File Organizations and Indexing

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Querying Semi-Structured Data

... the structure is potentially \deeply nested" or even cyclic. This second point in particular defeats calculi and algebras developed in the standard database context (e.g., relational, complex value algebra) by requiring recursion. It seems that languages such as Datalog (see [Ull89, AHV94]) although ...
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Database model



A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.
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