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SQL Development
OpenEdge SQL Data Definition Language : Maintaining data integrity

Maintaining data integrity

Integrity constraints are application rules that the database enforces. You define integrity constraints on base tables to ensure data integrity. An integrity constraint can specify unique values for a column, validate values of a column, or provide referential integrity.
Referential integrity ensures that a specific piece of data is consistent throughout the database. For instance, a customer's name will be spelled the same way when it appears in tables for purchase orders, merchandise shipments, and accounts receivable.
* Need for integrity constraints
* Types of integrity constraints
* Referential constraints
* Handling cycles in referential integrity