oracle 找出主鍵被哪些表的字段作為外鍵來使用

select c.TABLE_NAME tablename,c.constraint_name foreignname,u.column_name columnname
from all_constraints p, all_constraints c,user_cons_columns u
where p.table_name = 'T_SJZX_DBITEM'
and p.OWNER = SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')
and c.OWNER=SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')
and c.constraint_type = 'R'
and c.CONSTRAINT_NAME=u.constraint_name
and