Query to find consecutive dates

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Query to find consecutive dates

Author

Topic

sudipbh
Starting Member

3 Posts

Posted - 2008-04-17 : 07:12:48

Hello all,

Here is one scenario that: I need one query based on one table which is having data like:

RequestId Dept Date
1001 1 10/10/2008 9:30
1001 2 10/10/2008 9:31
1001 1 10/10/2008 11:40
1001 3 10/10/2008 11:55

I have to find out the difference between 2 consecutive dates like:
diffenrece between (10/10/2008 9:30 and 10/10/2008 9:31) then (10/10/2008 9:31 and 10/10/2008 11:40) and so on.

I have to do it using SQL query only in SQl server 2005.
There is no primary key field in the table and i can't create one extra columns also.

Can anyone help me with this? urgent.

Thanks & Regards,
Sudip

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2008-04-17 : 07:19:46

Cross post
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=101166

E 12°55'05.25"
N 56°04'39.16"

RyanRandall
Master Smack Fu Yak Hacker

1074 Posts

Posted - 2008-04-17 : 07:21:11

Here's one way...

 
--Preparation (you may not need some of this if you have it already)
declare @t table (RequestId int, Dept int, Date datetime)
insert @t
          select 1001, 1, '10/10/2008 9:30'
union all select 1001, 2, '10/10/2008 9:31'
union all select 1001, 1, '10/10/2008 11:40'
union all select 1001, 3, '10/10/2008 11:55'

--Query (the bit you need)
select *, datediff(minute, (select top 1 Date from @t where Date < a.Date order by Date desc), Date) as MinutesSincePreviousEntry from @t a

 /* Results
RequestId   Dept        Date                    MinutesSincePreviousEntry
----------- ----------- ----------------------- -------------------------
1001        1           2008-10-10 09:30:00.000 NULL
1001        2           2008-10-10 09:31:00.000 1
1001        1           2008-10-10 11:40:00.000 129
1001        3           2008-10-10 11:55:00.000 15
*/

Ryan Randall
Solutions are easy. Understanding the problem, now, that's the hard part.

RyanRandall
Master Smack Fu Yak Hacker

1074 Posts

Posted - 2008-04-17 : 07:23:21

quote:
Cross post

Grrr

Ryan Randall
Solutions are easy. Understanding the problem, now, that's the hard part.

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