DBA_CONSTRAINTS

DBA_CONSTRAINTS displays information about table constraints in database. It is accessible only to users with system administrator rights.

Name	Type	Description
constraint_name	vcharacter varying(64)	Constraint name
constraint_type	text	Constraint type C: Check constraint. F: Foreign key constraint P: Primary key constraint U: Unique constraint.
table_name	character varying(64)	Name of constraint-related table
index_owner	character varying(64)	Owner of constraint-related index (only for the unique constraint and primary key constraint)
index_name	character varying(64)	Name of constraint-related index (only for the unique constraint and primary key constraint)