March 2015 Archive


Interpreting Queries Involving Views

We can get a good idea of what view queries mean by following the way a query involving a view would be processed. The matter is taken up in more generality in "Algebraic Laws for Improving Query Plans", when we study query processing in general.

Constraints and Triggers

In this section we shall study those aspects of SQL that let us create "active" elements. An active element is an expression or statement that we write once, store in the database, and expect the element to execute at appropriate times. The time of action might be when a certain

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