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PROC SQL: Beyond the Basics Using SAS® by Kirk Paul Lafler

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5.4. Integrity Constraints

The reliability of databases and the data within them is essential to every organization. Decision-making activities depend on the correctness and accuracy of any and all data contained in key applications, information systems, databases, decision support and query tools, as well as other critical systems. Even the slightest hint of unreliable data can affect decision-making capabilities, accuracy of reports, and, in those worst case scenarios, loss of user confidence in the database environment itself.

Because data should be correct and free of problems, an integral part of every database environment is a set of rules that the data should adhere to. These rules, often referred to as database-enforced constraints, ...

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