On Thu, 26 Mar 2015 00:25:09 +0000
"Lavrenz, Steven M" <slavr...@purdue.edu> wrote:
> I have a second table (TABLE B) with all of the object_ids and channels that
> are supposed to be reporting in each day. For cases where a certain channel
> does not check in, I want to add a column that indicates the comm failure.
Not sure if your context allows it, but if you can change your program's logic,
it might be easier to :
-add a boolean field (e.g. 'checked') to table B, set to false
-whenever an object checks in do 'update table B set checked = true where
object_id = X and channel = Y'
-run a cron job once a day that
-runs 'select * from B where checked = false' and stores results
somewhere
-resets B with 'update B set checked = false'
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