Sql server 使用subselect向视图添加更多列

使用Microsoft SQL Server 2012，我试图创建一个新视图，当描述匹配时，该视图将返回一行的实际开始和结束

我有一张像这样的桌子

+----+-------+-------+-----+
| ID | desc  | start | end | 
+----+-------+-------+-----+
|  1 | line1 |     0 | 100 |
|  2 | line2 |     0 | 100 |
|  3 | line2 |   101 | 200 | 
+----+-------+-------+-----+

我想再添加两列，这样当desc匹配时，它将从ID 2返回0，从ID 3返回200，如下所示：

+----+-------+-------+-----+------------+----------+
| ID | desc  | start | end | real_start | real_end |
+----+-------+-------+-----+------------+----------+
|  1 | line1 |     0 | 100 |          0 |      100 |
|  2 | line2 |     0 | 100 |          0 |      200 |
|  3 | line2 |   101 | 200 |          0 |      200 |
+----+-------+-------+-----+------------+----------+

到目前为止，我的语法是：

CREATE VIEW tableview1 
AS 
     SELECT 
         ID, desc,
         start, end,
         (???) as real_start,
         (???) as real_end 
     FROM 
         linetable 
     WHERE 
         condition;

当描述匹配时，我不知道如何对这两行进行分组和比较，并从中选择最低的一行。我会自己玩并更新线程

---

非常感谢

对于

desc

我认为这会起作用，有人能确认吗

    CREATE VIEW tableview1 
AS 
     select 
     t1.ID, t1.desc,
     t1.start, t1.end,
     (select min(start)
        from linetable z
        where z.desc = t1.desc) as real_start,
     (select min(end)
        from linetable z
        where z.desc = t1.desc) as real_end
     from    
     (SELECT 
         ID, desc,
         start, end,
     FROM 
         linetable 
     WHERE 
         condition) as t1

---

请不要张贴代码或数据的图片。没有人可以复制和粘贴来帮助您。根据需要编辑您的问题。也，