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Looping for a particular datetime

I have a databases which stores dates for a particular process.  The process can have many different elements i.e can be changed from one stage to another, pending, here, their, anywhere...

example

Process 123456
                                MODDATE                                                STAGEDATE
                          1      13/10/2008  10:06:31                             13/10/2008  10:06:31
                          2      13/10/2008  10:06:31                             13/10/2008  10:06:31
                          3      13/10/2008  10:09:45                             13/10/2008  10:06:31
                          4      13/10/2008  10:46:08                             13/10/2008  10:49:31
                          5      13/10/2008  10:51:19                             13/10/2008  10:51:20

Here the stage date is what is of interest.  I need to use crystal, a formula Im assuming to get the STAGEDATE which signifies a change.  In this case it would be RowNum 4 albeit 5 is different Im only interested in 4.  How can I use Crystal to look through each record to do it .  Bear in mind their are 1000s of different processes.  A typical process could be - PAYJOEBLOGGS which has several elements in its actual completion such as start, pending, waiting, departmentx etc.  The table is called PROCESS and each unique processID has lots of different elements as I have depicted above, 1,2,3,4 & 5 all belong to process 123456.  Im messing abotu with WHILEREADINGRECORD etc but I think a loop is needed.

Thanks


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BPMonk
Asked:
BPMonk
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1 Solution
 
mlmccCommented:
You cannot truly loop through the records in Crystal.

Crystal works on 1 record at a time and handles the "looping" for you.

You can group on the process id
In the detail sectiion you can add a formula that compares the ModDate and Stage date  like

If {ModDateField} <> {StageDateField} then
    Do something

mlmcc
0
 
BPMonkAuthor Commented:
Trouble is mlmcc is that I need to get only the one record where their was a change, in thsi case

4      13/10/2008  10:46:08                             13/10/2008  10:49:31

I then need to compare this to the start time 13/10/2008  10:06:31    and acquire the difference.
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BPMonkAuthor Commented:
What I could do is set a flag where their is a change i.e

                          1      13/10/2008  10:06:31                             13/10/2008  10:06:31                      0
                          2      13/10/2008  10:06:31                             13/10/2008  10:06:31                      0
                          3      13/10/2008  10:09:45                             13/10/2008  10:06:31                      0
                          4      13/10/2008  10:46:08                             13/10/2008  10:49:31                      1
                          5      13/10/2008  10:51:19                             13/10/2008  10:51:20                      2

This sets the first change as 1 and the second as 2.  I can then get rid of antything that isnt 1 then write a formula to calculate the variance...
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mlmccCommented:
I assume you have a group on the process id
In the group header add a formula
WhilePrintingRecords;
Global DateTimeVar ProcessStartTime;
ProcessStartTime := {ModDate};
''

In the formula I provided

WhilePrintingRecords;
Global DateTimeVar ProcessStartTime;
If {ModDateField} <> {StageDateField} then
    DateDiff('s',   ProcessStartTime, {StageDateField})

If you want to display it as something other than seconds then you need to add code to convert the seconds to the format you want.

mlmcc
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