SQL：将小跨度变成1个大连续跨度

我有一些数据，一段时间后，一类数据可以更新

         ID       Type         Start           End
         1         A            01/01/2017     02/01/2017
         1         A            02/01/2017     03/01/2017
         1         A            03/01/2017     05/01/2017
         1         A            04/01/2017     06/01/2017
         1         A            09/01/2017     10/01/2017

我目前正在做以下工作

   SELECT 
       A.ID,
       A.Type,
       B.Start,
       A.End
   FROM my_data as A
   INNER JOIN my_data as B
       ON A.ID = B.ID
       AND A.start>B.start
       AND A.start < B.end
   WHERE A.type = B.Type
    AND A.end-B.start <=365;

我只是在新桌子上重复类似的逻辑。但在现实生活中，这需要很多次，感觉应该有一个更简单的解决方案

我想要的桌子是这样的：

        ID          Type     Start           End
         1           A       01/01/2017      06/01/2017 
         1           A       09/01/2017      10/01/2017

---

Teradata提供了标准SQL的良好扩展，以规范重叠范围：

SELECT 
   ID
  ,Type
  -- split the period back into seperate dates
  ,Begin(pd) AS Start
  ,End(pd) AS End
FROM
 (
   SELECT NORMALIZE 
      ID
     ,Type
     -- NORMALIZE only works with periods, so create it on the fly
     ,PERIOD(Start, End) AS pd
   FROM my_data 
 ) AS dt

SELECT 
   ID
  ,Type
  -- split the period back into seperate dates
  ,Begin(pd) AS Start
  ,End(pd) AS End
FROM
 (
   SELECT NORMALIZE 
      ID
     ,Type
     -- NORMALIZE only works with periods, so create it on the fly
     ,PERIOD(Start, End) AS pd
   FROM my_data 
 ) AS dt