Oracle Data Integrity Explained

In Oracle, data integrity can be ensured through several methods, including:

1. Primary key constraint: It is a constraint that uniquely identifies each record in a table, ensuring that each record in the table has a unique identifier and prevents the insertion of duplicate data.
2. Foreign key constraint: A foreign key constraint is used to ensure that the values in the child table’s foreign key must be the same as the values in the parent table’s primary key, in order to maintain referential integrity between the tables.
3. One restriction: The unique constraint is used to ensure that the values in a column of a table are unique, preventing the insertion of duplicate data.
4. Not null constraint: The not null constraint is used to ensure that a column has a value and to prevent the insertion of empty or NULL values.
5. Check constraints are used to limit the range of values for a column, ensuring that the data being inserted meets specific conditions.

By using the constraints mentioned above, data integrity can be effectively ensured, preventing incorrect insertion or modification of data, and ensuring its accuracy and consistency.