select
 a.name as 约束名,
 object_name(b.parent_object_id) as 外键表,
 d.name as 外键列,
 object_name(b.referenced_object_id) as 主健表,
 c.name as 主键列
 from sys.foreign_keys A
 inner join sys.foreign_key_columns B on A.object_id=b.constraint_object_id
 inner join sys.columns C on B.parent_object_id=C.object_id and B.parent_column_id=C.column_id
 inner join sys.columns D on B.referenced_object_id=d.object_id and B.referenced_column_id=D.column_id