Oracle Foreign Key Constraint Explained

In Oracle, foreign key constraints are used to ensure reference relationships between the values in a column (child table) in one table and the values in a column (parent table) in another table, thus ensuring data integrity and consistency. Foreign key constraints can prevent situations where incorrect relationships occur when inserting or updating data, for example, the foreign key value in the child table must be a primary key value in the parent table, otherwise the operation will be rejected. Foreign key constraints can also automatically handle cascading actions, such as deleting or updating related records in the child table when records in the parent table are deleted or updated.