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Oracle: How to calculate time according to row

Posted on 2011-03-03
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Last Modified: 2013-12-19
Hello Again,
I have a table that holds data regarding the users' activity on the phone. It looks like this

Agent      date      signofftime      status
John      1/4/2011      11:17:33      BREAK                        
John      1/4/2011      11:35:56      Signed ON
John      1/4/2011      13:47:08      LUNCH                        
John      1/4/2011      14:22:43      Signed ON
Jane      1/4/2011      11:18:23      BREAK                        
Jane      1/4/2011      11:34:23      Signed ON
Jane      1/4/2011      12:00:05      LUNCH                        
Jane      1/4/2011      12:30:24      Signed ON

I want to calculate the time difference in hh:mm:ss between break and lunch status and the 'SignOn' time that immediately follows on the next row.

This table holds multiple users and multiple dates. It is certain tho that the Break and Lunch statuses are always followed by Signed on.

thank you in advance!

lemmohr
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Question by:lemmohr
6 Comments
 

Author Comment

by:lemmohr
ID: 35027031
how do i edit the points here? I put 250 by mistake, should be 500
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LVL 74

Accepted Solution

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sdstuber earned 500 total points
ID: 35027061
SELECT *
  FROM (SELECT agent,
               status,
               t,
               TO_CHAR(
                   TRUNC(SYSDATE)
                   + (t - LAG(t) OVER (PARTITION BY agent ORDER BY t)),
                   'hh24:mi:ss'
               )
                   diff
          FROM (SELECT agent,
                       TO_DATE(
                           signoffdate || signofftime,
                           'mm/dd/yyyyhh24:mi:ss'
                       )
                           t,
                       status
                  FROM yourtable))
 WHERE diff IS NOT NULL
ORDER BY agent, t
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Expert Comment

by:sdstuber
ID: 35027070
I'm assuming your date strings are  mm/dd/yyyy,  if not, adjust the format accordingly in the to_date call
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Expert Comment

by:awking00
ID: 35028839
Given your example, what do you expect the output to look like?
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Expert Comment

by:NewDan526
ID: 35037756
Accurate analysis will save a lot of (re)development time and cost.  So its worth commenting on here...

ASSUMPTIONS/COMMENTS:
1. Your table looks like this: (I would consider making date and signofftime one timestamp column - unless you have a specific reason not to)
      CREATE TABLE timeclock
      (
         agent        VARCHAR2(20),
         signofftime  TIMESTAMP,
         status       VARCHAR2(20)
      );

2.  Your objective is to calculate the time your (presumably hard-working) employees are not working.

3. You are not addressing the last time on one day to the first on the next, and there are no night shifts crossing midnight.

4.  Your are NOT calculating how long they work (which would be a useful metric for the business since you should know when they leave for the day)

5. You are NOT covering any variations or exceptions (at this point), everybody always clocks in and out appropriately, and there are no data errors.

-------------
SOLUTION:
SELECT *
  FROM (SELECT agent,
               LAG(status) OVER (PARTITION BY agent ORDER BY SIGNOFFTIME) status,
               (SIGNOFFTIME - LAG(SIGNOFFTIME)
                  OVER (PARTITION BY agent ORDER BY SIGNOFFTIME)) as diff,
               SIGNOFFTIME
          FROM TIMECLOCK
          )
 WHERE diff IS NOT NULL
   and status in('BREAK','LUNCH')
ORDER BY agent, SIGNOFFTIME

--------------
RESULTS:
"AGENT"      "STATUS"      "DIFF"      "SIGNOFFTIME"
"Jane"      "BREAK"      0:16:0.0      04-JAN-11 11.34.23.000000000 AM
"Jane"      "LUNCH"      0:30:19.0      04-JAN-11 12.30.24.000000000 PM
"John"      "BREAK"      0:18:23.0      04-JAN-11 11.35.56.000000000 AM
"John"      "LUNCH"      0:35:35.0      04-JAN-11 02.22.43.000000000 PM
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Author Closing Comment

by:lemmohr
ID: 35189721
i apologize, I thought i already awarded the points.
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