A business rule typically starts out as a description. As you develop your model and analyze your business problem, you can complete a rule by adding a technical expression. The syntax of expressions depends on the target database.
Each business rule can include two types of expression:
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Server - can be generated to a database. You can generate server expressions as check parameters if they are attached to tables, domains, or columns
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Client - used mainly for documentation purposes. However, you can insert both types of expression into a trigger or a stored procedure