This document discusses key database constraints including primary keys, not null constraints, unique constraints, check constraints, and foreign key constraints. Foreign key constraints enforce referential integrity by ensuring that values in a child table match values present in the referenced column of the parent table.

1. Muhammad Umair
Oracle Database 11g Developer Track

2. › Primary key constraints
› Not null constraint
› Unique constraint
› Check constraint
› Foreign key constraint (referential integrity)
– DBMS ensure that value of child key must be present in parent key is
called referential integrity