oracle查看表之间主外键约束关系

select a.constraint_name, a.table_name, b.constraint_name
from user_constraints a, user_constraints b
where a.constraint_type = 'R'
and b.constraint_type = 'P'
and a.r_constraint_name = b.constraint_name
and b.table_name='FG_ROOM'
P 代表主键
R 代表外键