查询表的主外键信息sql

select a.table_name pk_table,
a.constraint_name pk_cons_name,
(select c.column_name
from user_cons_columns c
where c.constraint_name = a.constraint_name) pk_col,
a.r_constraint_name fk_cons_name,
(select c.table_name
from user_cons_columns c
where c.constraint_name = a.r_constraint_name) fk_table,
(select c.column_name
from user_cons_columns c
where c.constraint_name = a.r_constraint_name) fk_col
from user_constraints a
where constraint_type in ('P', 'R') -- p:pk , r - fk
and table_name in ('PK', 'FK')