Lag/Leap not the full solution.

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July 16th, 2009, 12:00 PM

InsureDesign

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Join Date: Apr 2004

Posts: 46

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Lag/Lead not the full solution.

Here is what I'm trying to do, I have a table that has, among other things, the following columns:

EVENT_ID,
AUDIT_ID,
EVENT_DATE

Here is some data

Code:

EVENT_ID       AUDIT_ID      EVENT_DATE
100143             153            07/15/2009
100142             153            07/15/2009
100132             153            07/01/2009
100102             153            06/23/2009
100152             326            07/16/2009
100137             326            07/03/2009
100011             326            06/06/2009
100141             257            07/15/2009
100120             257            06/28/2009
100150             186            07/16/2009
100148             186            07/16/2009
100123             186            06/28/2009

What I am trying to accomplish is the following:

- Get all of the events that happened either today or yesterday. This is the easy part.
- Take the AUDIT_ID of those events and go back to the next event that did not happen today or yesterday and retreive the date that it happened.
- Calculate the days between these events. This is also easy.

So basically in the end I am looking for the data to be similar to this:

Code:

AUDIT_ID      EVENT_DATE            PREV_DATE       DAYS
153               07/15/2009             07/01/2009         15    
326               07/16/2009             07/03/2009         14
257               07/15/2009             06/28/2009         18
186               07/16/2009             06/28/2009         17

I know I can use the Lag/Lead functions, but I can't figure out an efficent and accurate way to use them.

Any pointers/functions/code would be greatly appriciated. Incase you were wondering, I am using oracle.

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Last edited by InsureDesign : July 16th, 2009 at 12:24 PM.

September 23rd, 2009, 03:04 PM

gregory.owen@hp

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I haven't worked with Oracle since 9i, so I don't know if this will work or not, but it works in ms sql server:

Code:

select distinct s.audit_id, s.Event_Date, d.Prev_date, DATEDIFF(d, d.Prev_date, s.Event_Date) as days
from events s
join
(select audit_id, MAX(event_date) as prev_date from events
	WHERE event_date < dateadd(d,-1,'2009-07-16')
	GROUP BY audit_id) d
on s.audit_id = d.Audit_id 
WHERE s.Event_Date >= dateadd(d,-1,'2009-07-16')

October 12th, 2009, 04:27 AM

sakthi.tnj

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Join Date: Sep 2009

Posts: 24

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Re: Lag/Leap not the full solution

Hi,

I hope that the below SQL query will be very useful for you....

If you consider the event date as a current date, use the following query

Code:

Select 
		a.audit_id as Audit_id, 
		convert(char,a.event_date,101) as Event_date,
		convert(char,b.event_date,101) as Previousdate,
	datediff(dd,convert(char,b.event_date,101),convert  (char,a.event_date,101)) as Days
from 
		test2 a INNER JOIN
		(Select audit_id , event_date, rno from(select audit_id, 
event_date,
row_number()over(partition by audit_id order by event_date desc)as rno from test2)tbl 
		where rno =2)b on a.audit_id = b.audit_id
where 
		(convert(char,a.event_date,101) = convert(char,getdate(),101) or
		datepart(dd,convert(char,a.event_date,101)) = (datepart(dd,convert(char,getdate(),101))-1))

If you consider the event date as max date, use the following query.

Code:


Select 
		a.audit_id as Audit_id, 
		max(convert(char,a.event_date,101))as Event_date, 
		convert(char,b.event_date,101) as Previousdate, 
		datediff(dd, convert(char,b.event_date,101),max (convert(char ,a.event_date,101)))as Days  
from 
		test2 a,
		(select 
                     event_date,
row_number()over(partition by audit_id order by event_date desc)as rno from test2)b
where 
		b.rno = 2 
group by
		 audit_id, 
		b.event_date

Note: Test2 is a table name

Thanks & Regards
Sakthimeenakshi.S
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