SQL Server 2008、临时表、游标

Question

我已经为此工作了一段时间了。我想知道如何获得这张 table :

id       open_dt             ops_hrs
1        10/31/2011          7:00AM - 5:30PM
2        11/1/2011           7:00AM - 5:00PM
3        11/2/2011           7:00AM - 5:00PM
4        11/3/2011           7:00AM - 5:00PM
5        11/6/2011           7:00AM - 7:00PM
6        11/8/2011           7:00AM - 5:00PM

看起来像这个表:

max_date          min_date     ops_hrs
10/31/2011        10/31/2011   7:00AM - 5:30PM
11/1/2011         11/3/2011    7:00AM - 5:00PM
11/6/2011         11/6/2011    7:00AM - 7:00PM
11/8/2011         11/8/2011    7:00AM - 5:00PM

我尝试使用光标，但没有必要。另外，它必须分组。一旦连续几天结束，就会出现新的分组。任何帮助将不胜感激。

此查询将生成上述示例数据

;
WITH pdog (id, open_dt,ops_hrs) AS
(
SELECT 1, CAST('10/31/2011' AS datetime),  '7:00AM - 5:30PM'
UNION ALL SELECT 2, CAST('11/1/2011' AS datetime),'7:00AM - 5:00PM'
UNION ALL SELECT 3, CAST('11/2/2011' AS datetime),'7:00AM - 5:00PM'
UNION ALL SELECT 4, CAST('11/3/2011' AS datetime),'7:00AM - 5:00PM'
UNION ALL SELECT 5, CAST('11/6/2011' AS datetime),'7:00AM - 7:00PM'
UNION ALL SELECT 6, CAST('11/8/2011' AS datetime),'7:00AM - 5:00PM'
)
SELECT * FROM pdog 

Answer 1

;WITH    CTE
          AS ( SELECT   * ,
                        DATEDIFF(DAY, 0, open_dt) -  ROW_NUMBER() OVER 
                              ( PARTITION BY ops_hrs ORDER BY open_dt ) AS Grp
               FROM     @x
             )
    SELECT  
            MIN(open_dt) AS min_date ,
            MAX(open_dt) AS max_date ,
            ops_hrs
    FROM    CTE
    GROUP BY ops_hrs ,
            Grp
    ORDER BY min_date