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Default Capturing data only when a column "Value" changes

What I need to accomplish is to get three items; tag, time, and value,
automatically copied into a clean worksheet every time the Widgets value
changes -- ON/OFF. As you can see from my mess below, I aint got the
faintest cue what Im doing.

Phase 1
I retrieve history on Tag, Time, and Value every minute during a
startup/shutdown process event I may have to go back 30 days. Raw data is
exported from a large db. I probably have 90 columns with around 1000 rows

Tag Time Value Tag Time Value
Widget A 09/30/2008 11:55:00 ON Widget B 09/30/2008 11:55:00 ON
Widget A 09/30/2008 11:56:00 ON Widget B 09/30/2008 11:56:00 ON
Widget A 09/30/2008 11:57:00 OFF Widget B 09/30/2008 11:57:00 ON
Widget A 09/30/2008 11:58:00 OFF Widget B 09/30/2008 11:58:00 OFF
Widget A 09/30/2008 11:59:00 OFF Widget B 09/30/2008 11:59:00 OFF
Widget A 10/01/2008 00:00:00 OFF Widget B 10/01/2008 00:00:00
Widget A 10/01/2008 00:01:00 ON Widget B 10/01/2008 00:01:00
Widget A 10/01/2008 00:02:00 OFF Widget B 10/01/2008 00:02:00 ON
Widget A 10/01/2008 00:03:00 ON Widget B 10/01/2008 00:03:00 ON
Widget A 10/01/2008 00:04:00 ON Widget B 10/01/2008 00:04:00 ON
Widget A 10/01/2008 00:05:00 OFF Widget B 10/01/2008 00:05:00 OFF
Widget A 10/01/2008 00:06:00 ON Widget B 10/01/2008 00:06:00 ON
Widget A 10/01/2008 00:07:00 ON Widget B 10/01/2008 00:07:00 ON
Widget A 10/01/2008 00:08:00 Widget B 10/01/2008 00:08:00
Widget A 10/01/2008 00:09:00 Widget B 10/01/2008 00:09:00
Widget A 10/01/2008 00:10:00 ON Widget B 10/01/2008 00:10:00 ON
Widget A 10/01/2008 00:11:00 OFF Widget B 10/01/2008 00:11:00 OFF
Widget A 10/01/2008 00:12:00 ON Widget B 10/01/2008 00:12:00 OFF
Widget A 10/01/2008 00:13:00 ON Widget B 10/01/2008 00:13:00 OFF
Widget A 10/01/2008 00:14:00 OFF Widget B 10/01/2008 00:14:00 ON
Widget A 10/01/2008 00:15:00 OFF Widget B 10/01/2008 00:15:00 OFF
Widget A 10/01/2008 00:16:00 ON Widget B 10/01/2008 00:16:00 ON

-----------------------------------------------------------------------------------------------------------------------------------------------
Phase 2

Tag Time Value Tag Time Value
Widget A 09/30/2008 11:55:00 ON Widget B 09/30/2008 11:55:00 ON

Widget A 09/30/2008 11:57:00 OFF Widget B 09/30/2008 11:58:00 OFF


Widget A 10/01/2008 00:01:00 ON
Widget A 10/01/2008 00:02:00 OFF Widget B 10/01/2008 00:02:00 ON
Widget A 10/01/2008 00:03:00 ON

Widget A 10/01/2008 00:05:00 OFF Widget B 10/01/2008 00:05:00 OFF
Widget A 10/01/2008 00:06:00 ON Widget B 10/01/2008 00:06:00 ON




Widget A 10/01/2008 00:11:00 OFF Widget B 10/01/2008 00:11:00 OFF
Widget A 10/01/2008 00:12:00 ON

Widget A 10/01/2008 00:14:00 OFF Widget B 10/01/2008 00:14:00 ON

Widget A 10/01/2008 00:16:00 ON Widget B 10/01/2008 00:16:00 ON

-----------------------------------------------------------------------------------------------------------------------------------------------------
Phase 3
This is what I need to have at the end of the day -- but slowly getting
here, however using a few manual tasks.

Tag Time Value Tag Time Value
Widget A 09/30/2008 11:55:00 ON Widget B 09/30/2008 11:55:00 ON
Widget A 09/30/2008 11:57:00 OFF Widget B 09/30/2008 11:58:00 OFF
Widget A 10/01/2008 00:01:00 ON Widget B 10/01/2008 00:02:00 ON
Widget A 10/01/2008 00:02:00 OFF Widget B 10/01/2008 00:05:00 OFF
Widget A 10/01/2008 00:03:00 ON Widget B 10/01/2008 00:06:00 ON
Widget A 10/01/2008 00:05:00 OFF Widget B 10/01/2008 00:11:00 OFF
Widget A 10/01/2008 00:06:00 ON Widget B 10/01/2008 00:14:00 ON
Widget A 10/01/2008 00:11:00 OFF Widget B 10/01/2008 00:16:00 OFF
Widget A 10/01/2008 00:12:00 ON
Widget A 10/01/2008 00:14:00 OFF
Widget A 10/01/2008 00:16:00 ON


 
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