Progress
Embedded SQL-92
Guide and Reference
Integrity Constraints
Integrity constraints are application rules that the database enforces. You define integrity constraints on base tables to ensure data integrity in a database. An integrity constraint can specify unique values for a column, validate values of a column, or provide referential integrity.
Referential integrity ensures that the relationships among different rows of the same or different tables are valid. For example, you might use referential integrity to ensure that a master row is inserted before a detail row, and a detail row is deleted before a master row.
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