find maximum overlapping period from date ranges

Posted by Manish427 under Sql Server on 12/5/2013 | Points: 10 | Views : 1870 | Status : [Member] | Replies : 4
I want maximum period of date range that is overlapping each other and
if the period is not clashing other date ranges than i want it as it is.

I have this table :

CREATE TABLE [dbo].[table1](

[id] [numeric](18, 0) IDENTITY(1,1) NOT NULL,

[StartDate] [datetime] NOT NULL,

[EndDate] [datetime] NOT NULL

)


And their respective values:


INSERT [dbo].[table1] VALUES ( CAST('2013-11-01 00:00:00.000' AS DateTime), CAST('2013-11-10 00:00:00.000' AS DateTime))

INSERT [dbo].[table1] VALUES ( CAST('2013-11-05 00:00:00.000' AS DateTime), CAST('2013-11-15 00:00:00.000' AS DateTime))

INSERT [dbo].[table1] VALUES ( CAST('2013-11-10 00:00:00.000' AS DateTime), CAST('2013-11-15 00:00:00.000' AS DateTime))

INSERT [dbo].[table1] VALUES ( CAST('2013-11-10 00:00:00.000' AS DateTime), CAST('2013-11-25 00:00:00.000' AS DateTime))

INSERT [dbo].[table1] VALUES ( CAST('2013-11-26 00:00:00.000' AS DateTime), CAST('2013-11-29 00:00:00.000' AS DateTime))


And expected result is :

ID StartDate EndDate

1 1-Nov-2013 25-Nov-2013

2 26-Nov-2013 29-Nov-2013



Thanks in advance.

Manish Insan
Software Developer



Responses

Posted by: Bandi on: 12/5/2013 [Member] [MVP] Platinum | Points: 25

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SELECT MinDate, MAX(EndDate)
FROM table1 t1
CROSS APPLY (SELECT MIN(StartDate) MinDate
FROM table1 t2
WHERE t1.StartDate BETWEEN t2.StartDate AND t2.EndDate
) t
GROUP BY MinDate


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Chandu
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Posted by: Manish427 on: 12/5/2013 [Member] Starter | Points: 25

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Hi Chandu,
Thanx, It helped me to get the result at some extant but some where it fail when i tried for this input:
ID StartDate EndDate
1 24-Sep-2013 27-Sep-2013
2 26-Sep-2013 5-Oct-2013
3 4-Oct-2013 10-Oct-2013
4 9-Oct-2013 25-Oct-2013
5 26-Nov-2013 29-Nov-2013

Expected output is:
ID StartsDate EndDate
1 24-Sep-2013 25-Oct-2013
2 26-Nov-2013 29-Nov-2013

But it returned:
ID StartDate EndDate
1 24-Sep-2013 5-Oct-2013
2 26-Sep-2013 10-Oct-2013
3 4-Oct-2013 25-Oct-2013
4 26-Nov-2013 29-Nov-2013



Manish Insan
Software Developer

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Posted by: Allemahesh on: 12/5/2013 [Member] [MVP] Silver | Points: 25

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Dear Manish Insan,

I have checked your problem and below query will solve you problem.

SELECT MIN(tb1.StartDate), MAX(tb2.EndDate) FROM [Table] tb1 INNER JOIN [Table] tb2

ON tb1.id = tb2.id - 1
WHERE tb1.EndDate > tb2.StartDate
UNION
SELECT MIN(tb2.StartDate), MAX(tb2.EndDate) FROM [Table] tb1 INNER JOIN [Table] tb2
ON tb1.id = tb2.id - 1
WHERE tb1.EndDate < tb2.StartDate


Please let me know if you have any issue?

If this helps you towards the solution, click on MARK IT AS ANSWER

Happy Coding.

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Posted by: Manish427 on: 12/5/2013 [Member] Starter | Points: 25

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Hi Allemahesh,

This date ranges are not fix, it may be any range, which may overlap each other or may not be.
If any date range is overlapping the other then i need to extract that maximum date range. if none of the date range is overlapping then i want result as it is.
you can verify this is not working for this type of case:
ID StartDate EndDate
1 24-Sep-2013 27-Sep-2013
2 26-Sep-2013 5-Oct-2013
3 7-Oct-2013 10-Oct-2013
4 9-Oct-2013 25-Oct-2013
5 26-Nov-2013 29-Nov-2013


Manish Insan
Software Developer

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