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03.27.2008 at 11:43PM PDT, ID: 23276556
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Need help with an sql statement
I have a table with a structure like this :

tbl_test:

(timestamp)      (varchar)
Time            EventName
-------------------------
10:00            Event1
10:01            Event1
10:02            Event2
10:03            Event2
10:04            Event2
10:05            Event1
10:06            Event1
10:07            Event1
10:08            Event2
10:09            Event2
10:10            Event2

I need to build a select statement to give me:
StartTime      EndTime            EventName
-----------------------------------------
10:00            10:01            Event1
10:02            10:04            Event2
10:05            10:07            Event1
10:08            10:10            Event2

Basically the events should be grouped but not all just group the rows that are consecutively one after another.

I built a select like:

select min(Time) as StartTime, max(Time) as StopTime, EventName
from tbl_test
group by EventName
order by StartTime

but the problem is that this select groups all the events, and the result is
StartTime      EndTime            EventName
-----------------------------------------
10:00            10:07            Event1
10:02            10:10            Event2

which is not ok for me because I want to see for each event the separate duration.


Can you please help me ?

Thank you,
Marius
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Question Stats
Zone: Database
Question Asked By: ciorecu
Solution Provided By: ee_rlee
Participating Experts: 1
Solution Grade: A
Views: 0
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03.27.2008 at 11:53PM PDT, ID: 21228423

Rank: Master

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03.28.2008 at 06:11AM PDT, ID: 21229999

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03.28.2008 at 06:14AM PDT, ID: 21230033

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03.28.2008 at 06:15AM PDT, ID: 21230039

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03.28.2008 at 06:16AM PDT, ID: 21230042

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03.27.2008 at 11:53PM PDT, ID: 21228423

Rank: Master

hi, try this

select min(Time) as StartTime, max(Time) as StopTime, EventName
from tbl_test T
group by EventName, (SELECT COUNT(EventName) FROM tbl_test WHERE Time<T.Time AND EventName != EventName)
order by StartTime
 
03.28.2008 at 06:11AM PDT, ID: 21229999
Hi,

   I tried the code but i get the same results as my original query
select min(Time) as StartTime, max(Time) as StopTime, EventName
from tbl_test
group by EventName
order by StartTime

  What I need is separate events.

Thank you
 
03.28.2008 at 06:14AM PDT, ID: 21230033

Rank: Master

sorry, I missed something. Can you try again?
1:
2:
3:
4:
select min(Time) as StartTime, max(Time) as StopTime, EventName
from tbl_test T
group by EventName, (SELECT COUNT(EventName) FROM tbl_test WHERE Time<T.Time AND EventName != T.EventName)
order by StartTime
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Accepted Solution
 
03.28.2008 at 06:15AM PDT, ID: 21230039
Hey, is me again.
You're select was ok, except you forgot to add a T :
Instead of : EventName != EventName  -> EventName != T.EventName


Thank you so much, I'll give you the points.
Marius

p.s. one single issue maybe, do you think is there any optimization posible for that query ?
 
03.28.2008 at 06:16AM PDT, ID: 21230042
It seems we corrected in the same time :))
 
 
03.28.2008 at 06:19AM PDT, ID: 21230076
thanks for the points :)

I'm not sure about the optimization, maybe you could do some test on your actual db?
 
 
 
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