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POCalculate difference between rows with counter values in SQL
 

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  1. POCalculate difference between rows with counter values in SQL
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    <p>I got table T1 where I update some counters values</p> <pre><code>id, unix_time_stamp, counter1, counter10 1 , 1333435800 , 55 , 80 </code></pre> <p>then i got table T2 where i copy those values</p> <pre><code>id, unix_time_stamp, counter1, counter10, value1, value10 1 , 1333435800 , 55 , 80 , 0 , 0 2 , 1333435801 , 60 , 87 , 5 , 7 3 , 1333435802 , 70 , 90 , 10 , 3 3 , 1333435804 , 80 , 100 , 5 , 5 </code></pre> <p>this is done with some trigger function</p> <pre><code>INSERT INTO T2 (unix_time_stamp, counter1, counter10) SELECT unix_time_stamp, counter1, counter10 FROM T1 WHERE id=1 </code></pre> <p>What i want is to calculate value1, value10 as a</p> <pre><code>(current_counter1 - last_counter1)/(current_time - last_time) </code></pre> <p>and put them in this insert.</p> <p>for example value 1 with timestamp 1333435804 will be</p> <pre><code>value1=(80-70)/(1333435804-1333435802) = 5 </code></pre> <p>other words</p> <pre><code>insert into t2 (unix_time_stamp, counter1, counter10, value1) SELECT unix_time_stamp, counter1, counter10, (counter1 - (select counter1 from T1 order by unix_time_stamp DESC LIMIT 1)/ (unix_time_stamp - (select unix_time_stamp from T1 order by unix_time_stamp DESC LIMIT 1) FROM T1 WHERE id=1 </code></pre> <p>but i want this in a little shorter version because i got 10 counters :)</p> <p>Whole situation is little bit complicated, and i got some reason to not do this outside SQL</p> <p>I am using sqlite</p> <p>This is just to complicated to me :) Please help.</p>
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    1. USluzik
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    1. COyour question is unclear please tell more clearly what you really want
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      1. USMuhammad Raheel
    2. COupdated, hope it is more clear right now.
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      1. USluzik
 

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