It has been suggested that this article or section be merged with data integrity. (Discuss) Proposed since March 2011.
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Database integrity ensures that data entered into the database is accurate, valid, and consistent. Any applicable integrity constraints and data validation rules must be satisfied before permitting a change to the database.
Three basic types of database integrity constraints are:
Entity integrity, not allowing multiple rows to have the same identity within a table.
Domain integrity, restricting data to predefined data types, e.g.: dates.
Referential integrity, requiring the existence of a related row in another table, e.g. a customer for a given customer ID.
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