In addition to the basic tables and indexes in a DBEnvironment,
ALLBASE/SQL lets you create database objects known as constraints,
procedures, and rules, which provide for a high degree of data consistency
and integrity inside the DBEnvironment without the need for extensive
application programming. Constraints define
conditions on the rows of a table; procedures define
sequences of SQL statements that can be stored in the DBEnvironment
and applied as a group either through rules or through execution
by specific users; and rules let you define
complex relationships among tables by tying specific procedures
to particular kinds of data manipulation on tables. Together, these
tools let you store many of your organization's business rules in
the DBEnvironment itself, reducing the need for application code.
This chapter presents the following topics:
Using Integrity Constraints
