Question

我有一张带外键的表。如何判断FK是哪个表的主键？那里有大约200张桌子，而且我不知道如何找到这些信息的来源/连接位置。

Answer 1

这应该有所帮助。只需在您要查询的数据库中运行它：

SELECT f.NAME AS ForeignKey
    ,SCHEMA_NAME(f.SCHEMA_ID) SchemaName
    ,OBJECT_NAME(f.parent_object_id) AS TableName
    ,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS ColumnName
    ,SCHEMA_NAME(o.SCHEMA_ID) ReferenceSchemaName
    ,OBJECT_NAME(f.referenced_object_id) AS ReferenceTableName
    ,COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS ReferenceColumnName
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc ON f.OBJECT_ID = fc.constraint_object_id
INNER JOIN sys.objects AS o ON o.OBJECT_ID = fc.referenced_object_id
GO

来源：http://blog.sqlauthority.com/2009/02/26/sql-server-2008-find-relationship-of-foreign-key-and-primary-key-using-t-sql-find-tables-with-foreign-key-constraint-in-database/

基本上，第一列是FK，后面是FK架构和对象。以下是PK列名称，其架构和对象。

Answer 2

使用此..

SELECT fk.name,
       Object_name(fk.parent_object_id) [Parent table],
       c1.name                          [Parent column]
FROM   sys.foreign_keys fk
       INNER JOIN sys.foreign_key_columns fkc
               ON fkc.constraint_object_id = fk.object_id
       INNER JOIN sys.columns c1
               ON fkc.parent_column_id = c1.column_id
                  AND fkc.parent_object_id = c1.object_id
       INNER JOIN sys.columns c2
               ON fkc.referenced_column_id = c2.column_id
                  AND fkc.referenced_object_id = c2.object_id
WHERE  Object_name(fk.referenced_object_id) = 'Tablename' -- Replace with your tablename
       AND c2.name = 'Columname' -- Replace with your columname

或者只是使用

sp_help Tablename or [Alt]+F1

Answer 3

NoDisplayName或Kris G.的任何一个答案都应该有效，但如果你想在SSMS中更容易记住，只需右键单击外键并选择脚本为＆gt;创建到＆gt;新窗口。

然后，您将获得一个可用于（重新）创建FK的脚本，并且您将能够通过阅读脚本来查看它在哪个表中引用的列。

如何找到表外键的来源？

3 个答案: