外键列表及其引用的表 | 外键列表及其引用的表

本文介绍了外键列表及其引用的表的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试查找一个查询，该查询将为我返回表的外键以及它们引用的表和列的列表.

I'm trying to find a query which will return me a list of the foreign keys for a table and the tables and columns they reference. I am half way there with

SELECT a.table_name,
       a.column_name,
       a.constraint_name,
       c.owner
FROM ALL_CONS_COLUMNS A, ALL_CONSTRAINTS C
where A.CONSTRAINT_NAME = C.CONSTRAINT_NAME
  and a.table_name=:TableName
  and C.CONSTRAINT_TYPE = 'R'

但是我仍然需要知道该键引用了哪个表和主键.我怎么得到的?

But I still need to know which table and primary key are referenced by this key. How would I get that?

推荐答案

在表ALL_CONSTRAINTS的列r_owner和r_constraint_name中描述了所引用的主键.这将为您提供所需的信息:

The referenced primary key is described in the columns r_owner and r_constraint_name of the table ALL_CONSTRAINTS. This will give you the info you want:

SELECT a.table_name, a.column_name, a.constraint_name, c.owner,
       -- referenced pk
       c.r_owner, c_pk.table_name r_table_name, c_pk.constraint_name r_pk
  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.constraint_type = 'R'
   AND a.table_name = :TableName

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