Data Modeling - Data Integrity
1 - About
Data/Database integrity ensures that data entered into the database is:
- and consistent.
Three basic types of database integrity constraints are:
- Entity integrity, allowing no two 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.
Any applicable integrity constraints and data validation rules must be satisfied before permitting a change to the database.