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     Creating Constraints

Advantage Database Server v8.1: A Developer’s Guide

by Cary Jensen and Loy Anderson

  © 2007 Cary Jensen and Loy Anderson. All rights reserved.

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Data dictionaries support three types of constraint definitions: field-level, record-level, and referential integrity. While there are some similarities between these various types of constraints, the steps you take to implement them are quite different. As a result, the creation of each constraint type is described in its own section.

Both field-level and record-level constraints are actually properties of dictionary-bound tables. There are other field and table-related properties as well. The need to discuss constraints provides us with a fine opportunity to consider these properties in general.