获取开始日期和结束日期之间的日期间隔记录

I have two dates start date and end date . How can I know if between these two dates , I got 01/01 meaning new year .

我有两个日期开始日期和结束日期。我怎么知道这两个日期之间是否有01/01意味着新的一年。

For example :

例如 :

Table test 
id  start date    End date 

1   02/03/2013   19/09/2016
2   15/02/2015   30/06/2015

Output

id  start date    End date  
1   02/03/2013   31/12/2013
1   01/01/2014   31/12/2014
1   01/01/2015   31/12/2015
1   01/01/2016   19/09/2016
2   15/02/2015   30/06/2015

How to do something like that ?

怎么做那样的事情?

2 个解决方案

#1

You would know if the year component is different:

您会知道年份组件是否不同:

select t.*,
       (case when year(startdate) < year(enddate) then 1
             else 0
        end) as HasNewYear
from table t;

#2

You can use a recursive CTE to find all years between the two dates, then cast out the dates to DATETIME objects to get the desired output:

您可以使用递归CTE查找两个日期之间的所有年份,然后将日期转换为DATETIME对象以获得所需的输出:

;WITH CTE AS (
SELECT ID, DATEPART(YEAR, STARTDATE) AS YR, ENDDATE
FROM TABLE1
UNION ALL
SELECT ID, YR+1, ENDDATE
FROM CTE
WHERE YR < DATEPART(YEAR,ENDDATE))
SELECT A.ID, CASE WHEN CAST(A.YR AS VARCHAR)+'-01-01' > B.STARTDATE THEN CAST(A.YR AS VARCHAR)+'-01-01' ELSE B.STARTDATE END AS STARTDATE, CASE WHEN CAST(A.YR AS VARCHAR)+'-12-31' < B.ENDDATE THEN CAST(A.YR AS VARCHAR)+'-12-31' ELSE B.ENDDATE END AS ENDDATE
FROM CTE AS A
JOIN TABLE1 AS B
ON A.ID=B.ID
ORDER BY A.ID

#1