根据已知的主键查询所有引用这个主键的外键约束的名称和表

如果是SQL Server 2005或之后的版本，可以从sys.foreign_keys 视图中查询

假如主键表的名称是:Po

SELECT OBJECT_SCHEMA_NAME(parent_object_id) AS SchemaName, OBJECT_NAME(parent_object_id) AS TableName ,Name 
FROM sys.foreign_keys 
 WHERE referenced_object_id=OBJECT_ID('dbo.Po')