How to compare value before and after
hi,
one of the queried Values is the number of defective frames.Here, this value is compared with a previously sampled value
If now (after 10 s) this value is bigger than previous one ,then It saves new value otherwise loop will be continue.If again after (10s) the new value is bigger than previous new value then again saves this new point.how can i comapre value before and after?thanks.
Tadhika
Do you know what a shift register is? It preserves a value from one loop iteration to the next. Please read the LabVIEW Help on shift registers. There's is also a simple example that ships with LabVIEW that will give you the basic idea (Help -> Find Examples).
You can also use a Feedback Node in lieu of a shift register. Same concept, different implementation.
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I posted this awhile back but I'm back to trying to solve the problem (didn't solve it), so apologies if that is bad etiquette! This forum has been so helpful though I thought I would try again:
design/methodology question
The short of it is I have a table with calls that happened, all have a start and end time.
I want to take 1 min intervals over a given hour (say, 12-1pm) and (the part I need help with) count all calls that happened before and after that interval.
That is to say, all calls that were 'active' during that interval (consider if I call started at 11:59 am and ended at 12:05) would need to be counted for the 12:00, 12:01, 12:02, 12:03, 12:04, and 12:05 intervals.
So what I'm trying to construct is an SQL query that uses a 'variable' in this case (I think).
That is, so I can saw 'where start_time < min_interval' and where 'end_time is > min_interval' and count those records to my total.
But I'm at a loss on how to pull this off!
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1 + 2 - 3 + 4
Oracle version is 10.2.0.4.0
I will work on learning the CREATE TABLE and INSERT statements, as well as, the WITH one.
Is the point of submitting those to understand the data set being worked with?
Here is my attempt...
Consider the following:
WITH my_call AS
SELECT 1 AS call_id , to_date('10-may-2011 12:00:17'
, 'dd-mon-yyyy hh24:mi:ss'
) AS start_time , to_date('10-may-2011 12:01:23'
, 'dd-mon-yyyy hh24:mi:ss'
) AS end_time FROM dual UNION ALL
SELECT 2 , to_date('10-may-2011 12:00:45'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:03:55'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 3 , to_date('10-may-2011 12:01:01'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:01:59'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 4 , to_date('10-may-2011 12:01:45'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:04:43'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 5 , to_date('10-may-2011 12:02:33'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:08:05'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 6 , to_date('10-may-2011 12:02:35'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:04:56'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 7 , to_date('10-may-2011 12:03:02'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:05:13'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual UNION ALL
SELECT 8 , to_date('10-may-2011 12:03:41'
, 'dd-mon-yyyy hh24:mi:ss'
) , to_date('10-may-2011 12:04:37'
, 'dd-mon-yyyy hh24:mi:ss'
) FROM dual
)then, to solve #1 (calls that started in each minute):
select
to_char(new_time(trunc(start_time, 'hh24') + (trunc(to_char(start_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') as "Start Time",
count(*) as "Start Time Count"
from
my_call
group by
to_char(new_time(trunc(start_time, 'hh24') + (trunc(to_char(start_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi')
order by
to_char(new_time(trunc(start_time, 'hh24') + (trunc(to_char(start_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi');would yield the following output (consider I am converting to GMT in this example):
07:00 2
07:01 2
07:02 2
07:03 2To solve 2, calls with end_time, I do the following:
select
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') as "End Time",
count(*) as "End Time Count"
from
my_call
GROUP BY to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi')
order by
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi');which gives us:
07:01 2
07:03 1
07:04 3
07:05 1
07:08 1# 3 (calls that started and ended in the same minute) is:
select
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') as "End Time",
count(*) as "End Time Count"
from
my_call
where
to_char(new_time(trunc(start_time, 'hh24') + (trunc(to_char(start_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') = to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi')
GROUP BY to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi')
order by
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi');which gives us:
07:01 1Now, given the small data set (which, as a side note, I can see a little, now, why the WITH statement here is useful and important!) we know the final output should be
(EXPECTED RESULT WHEN WE ARE DONE):
07:00 2
07:01 4
07:02 4
07:03 6
07:04 5
07:05 2
07:06 1
07:07 1
07:08 1So what I am posting this forum is help in calculating #4 - calls that had a start time (trunc'd to the minute) before the minute interval and an end_time after.
Something like this:
select
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') as "End Time",
count(*) as "End Time Count"
from
my_call
where
to_char(new_time(trunc(start_time, 'hh24') + (trunc(to_char(start_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') < minute_interval and
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi') > minute_interval
GROUP BY to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi')
order by
to_char(new_time(trunc(end_time, 'hh24') + (trunc(to_char(end_time, 'mi')/1)*1)/24/60, 'GMT', 'CDT'), 'hh24:mi');where the expected output would be:
07:00 0
07:01 1
07:02 2
07:03 3
07:04 2
07:05 1
07:06 1
07:07 1
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