oracle获取外键

Question

我想获取架构中的所有外键，就像这样。 假设我有桌子

users(id, username, pass, address_id)

和

addresses(id, text)

我在 users-address_id 上为地址中的 id 列定义了一个 FK。 我应该如何编写一个返回 FK 列的查询，例如： 用户，address_id，地址，id？

谢谢！

SELECT *
FROM all_cons_columns a
JOIN all_constraints c ON a.owner = c.owner
    AND a.constraint_name = c.constraint_name
JOIN all_constraints c_pk ON c.r_owner = c_pk.owner
    AND c.r_constraint_name = c_pk.constraint_name
WHERE  C.R_OWNER = 'TRWBI'

Answer 1

找到了！

这就是我要找的东西，谢谢大家的帮助。

SELECT a.table_name, a.column_name, uc.table_name, uc.column_name 
                FROM all_cons_columns a
                JOIN all_constraints c ON a.owner = c.owner
                    AND a.constraint_name = c.constraint_name
                JOIN all_constraints c_pk ON c.r_owner = c_pk.owner
                       AND c.r_constraint_name = c_pk.constraint_name
                join USER_CONS_COLUMNS uc on uc.constraint_name = c.r_constraint_name
                WHERE  C.R_OWNER = 'myschema'

Answer 2

使用@maephisto 解决方案会遇到一个小错误：
如果source tables primary key is a composite key 则运行查询将得到duplicate unnecessary records。

考虑 T1 和 T2 表：
主表 T1：

create table T1
(
  pk1 NUMBER not null,
  pk2 NUMBER not null
);
alter table T1
  add constraint T1PK primary key (PK1, PK2);

明细表T2：

create table T2
(
  pk1   NUMBER,
  pk2   NUMBER,
  name1 VARCHAR2(100)
);
alter table T2
  add constraint T2FK foreign key (PK1, PK2)
  references T1 (PK1, PK2);

@maephisto 查询的结果将是：



为了解决下面的查询将解决的问题：

SELECT master_table.TABLE_NAME  MASTER_TABLE_NAME,
       master_table.column_name MASTER_KEY_COLUMN,
       detail_table.TABLE_NAME  DETAIL_TABLE_NAME,
       detail_table.column_name DETAIL_COLUMN
  FROM user_constraints  constraint_info,
       user_cons_columns detail_table,
       user_cons_columns master_table
 WHERE constraint_info.constraint_name = detail_table.constraint_name
   AND constraint_info.r_constraint_name = master_table.constraint_name
   AND detail_table.POSITION = master_table.POSITION
   AND constraint_info.constraint_type = 'R'
   AND constraint_info.OWNER = 'MY_SCHEMA'

Answer 3

它们在系统视图中列出ALL_CONSTRAINTS

http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_1037.htm#i1576022

编辑

约束中涉及的列列在ALL_CONS_COLUMNS

http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_1035.htm#i1575870