新手，请问在哪里查看库中所有表的外键?

Question

select * from dba_constraints where constraint_type='R'

Answer 1

--Finding Primary Key–Foreign Key Relationships
SELECT c.constraint_name AS "Foreign Key",
       p.constraint_name AS "Referenced Key",
       p.constraint_type,
       p.owner,
       p.table_name
  FROM dba_constraints c, dba_constraints p
 WHERE c.owner = 'HR' AND c.table_name = 'EMPLOYEE' AND
       c.constraint_type = 'R' AND c.r_owner = p.owner AND
       c.r_constraint_name = p.constraint_name