Question

在StackOverflow中，我可以找到关于how to find all foreign key constraints in SQL Server的帖子。

我只能在Oralce（List of foreign keys and the tables they reference）中找到有关如何查找表的所有外键约束的帖子。

我的问题是：如何列出所有表的所有外键约束，而不是Oracle中的表。我的愿望答案将是this one，但对于Oracle。

P.S。我正在使用oralce 11g快递版。我的oracle GUI管理工具是Orace SQL开发人员。

Answer 1

我会那样做;

如果您希望它与同一行中的所有列聚合

select distinct c1.owner, c1.table_name, c1.constraint_name, c2.owner, c2.table_name, 
listagg(c2.column_name,',') WITHIN GROUP ( ORDER BY C2.POSITION) OVER ( PARTITION BY c1.owner, c1.table_name, c1.constraint_name, c2.owner, c2.table_name ) column_list
from dba_constraints c1
JOIN dba_cons_columns c2
ON c1.R_CONSTRAINT_NAME=C2.CONSTRAINT_NAME and c1.r_owner=c2.owner
where C1.constraint_type = 'R'

或类似的，如果你想要每列一行

select  c1.owner, c1.table_name, c1.constraint_name, c2.owner, c2.table_name, c2.column_name
from dba_constraints c1
JOIN dba_cons_columns c2
ON c1.R_CONSTRAINT_NAME=C2.CONSTRAINT_NAME and c1.r_owner=c2.owner
where C1.constraint_type = 'R'
order by c1.owner, c1.table_name, c1.constraint_name, c2.position

或者如果您想要引用列详细信息和引用的列详细信息

with constraint_colum_list as ( select owner, table_name, constraint_name, listagg(column_name,',') WITHIN GROUP ( order by position ) as column_list
                                FROM DBA_CONS_COLUMNS GROUP BY owner, table_name, constraint_name )
select distinct c1.owner, c1.table_name, c1.constraint_name, c2.column_list, c3.owner, c3.table_name, c3.constraint_name, c3.column_list
from DBA_constraints c1
JOIN constraint_colum_list c2 ON c1.CONSTRAINT_NAME=C2.CONSTRAINT_NAME and c1.owner=c2.owner
JOIN constraint_colum_list c3 ON C1.R_CONSTRAINT_NAME=C3.CONSTRAINT_NAME AND C1.R_OWNER=C3.owner
where C1.constraint_type = 'R' 
-- AND c1.owner = 'YOUR_SCHEMA';

Answer 2

不要在where where条件下使用Table name，你将获得所有表的FK约束。

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    C.CONSTRAINT_TYPE = 'R'
AND    C.OWNER = 'MyDBLoginName';

Answer 3

这个答案是基于LauDec的解决方案。

由于我只需要我/用户指定的所有外键约束，所以我将使用以下SQL：

with constraint_colum_list as ( select owner, table_name, constraint_name, listagg(column_name,',') WITHIN GROUP ( order by position ) as column_list
                                FROM USER_CONS_COLUMNS GROUP BY owner, table_name, constraint_name )
select distinct c1.owner, c1.table_name, c1.constraint_name, c2.column_list, c3.owner, c3.table_name, c3.constraint_name, c3.column_list
from USER_CONSTRAINTS c1
JOIN constraint_colum_list c2 ON c1.CONSTRAINT_NAME=C2.CONSTRAINT_NAME and c1.owner=c2.owner
JOIN constraint_colum_list c3 ON C1.R_CONSTRAINT_NAME=C3.CONSTRAINT_NAME AND C1.R_OWNER=C3.owner
where C1.constraint_type = 'R';

Answer 4

下面的查询给出了父表和子表的表名，列名以及每个表的约束名称。

select a.table_name child_table, a.column_name child_column, b.table_name parent_table, b.column_name parent_column, a.position, a.constraint_name child_constraint, b.constraint_name parent_constraint
from all_cons_columns a
join all_constraints lc on a.owner = lc.owner and a.constraint_name = lc.constraint_name
join all_constraints rc on lc.r_owner = rc.owner and lc.r_constraint_name = rc.constraint_name 
join all_cons_columns b on rc.owner = b.owner and rc.constraint_name = b.constraint_name and a.position = b.position
where a.owner = '<Schema Name>'
and lc.constraint_type = 'R'
order by a.constraint_name, a.table_name, a.position

以下是上述SQL中使用的表的简要说明：

all_constraints-具有约束名称，表名称，FK父表的约束名称。该表中的Constraint_type字段定义约束的类型，定义外键约束通过“ R”。
all_cons_columns-具有每个约束的列名称列表，此表中的position列定义了
的顺序约束中的列。

如何在oracle中找到所有外键约束？

4 个答案: