oracle查看表之间的关联关系--sql语句

select u1.CONSTRAINT_NAME, u1.TABLE_NAME as table_, u2.TABLE_NAME as reference_
from user_constraints u1, user_constraints u2
where
u1.constraint_type='R' and
u1.R_CONSTRAINT_NAME = u2.CONSTRAINT_NAME and
u2.table_name='target_table_name'