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POSQL Query for Null, Zero, and Constant Data
 

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  1. POSQL Query for Null, Zero, and Constant Data
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    <p>I have a query and I just want to modify it (This query is not written by me).</p> <pre><code>SELECT CAST(DATEPART(yyyy, UTCTimeStamp) AS VARCHAR(4)) + '-' + CAST(DATEPART(mm, UTCTimeStamp) AS VARCHAR(2)) + '-' + CAST(DATEPART(dd, UTCTimeStamp) AS VARCHAR(2)) + ' ' + CAST(DATEPART(hh, UTCTimeStamp) AS VARCHAR(2)) + ':00:000 - ' + CAST(DATEPART(yyyy, UTCTimeStamp) AS VARCHAR(4)) + '-' + CAST(DATEPART(mm, UTCTimeStamp) AS VARCHAR(2)) + '-' + CAST(DATEPART(dd, UTCTimeStamp) AS VARCHAR(2)) + ' ' + CAST(DATEPART(hh, UTCTimeStamp) AS VARCHAR(2)) + ':45:000' AS HourTime , SUM(CASE WHEN ElapsedValue IS NULL THEN 1 ELSE 0 END) AS NoData , SUM(CASE WHEN ElapsedValue = 0 THEN 1 ELSE 0 END) AS ZeroData FROM tblLive_TrendLog_15Min WHERE ISNULL(ElapsedValue, 0) = 0 GROUP BY CAST(DATEPART(yyyy, UTCTimeStamp) AS VARCHAR(4)) + '-' + CAST(DATEPART(mm, UTCTimeStamp) AS VARCHAR(2)) + '-' + CAST(DATEPART(dd, UTCTimeStamp) AS VARCHAR(2)) + ' ' + CAST(DATEPART(hh, UTCTimeStamp) AS VARCHAR(2)) + ':00:000 - ' + CAST(DATEPART(yyyy, UTCTimeStamp) AS VARCHAR(4)) + '-' + CAST(DATEPART(mm, UTCTimeStamp) AS VARCHAR(2)) + '-' + CAST(DATEPART(dd, UTCTimeStamp) AS VARCHAR(2)) + ' ' + CAST(DATEPART(hh, UTCTimeStamp) AS VARCHAR(2)) + ':45:000' </code></pre> <p>When I run this query, it is going to display: </p> <pre><code>HourlyTime ZeroData NULL 2013-6-8 23:00:000 - 2013-6-8 23:45:000 0 40 2013-6-8 3:00:000 - 2013-6-8 3:45:000 0 52 2013-6-8 7:00:000 - 2013-6-8 7:45:000 0 52 2013-6-9 3:00:000 - 2013-6-9 3:45:000 0 52 2013-6-9 4:00:000 - 2013-6-9 4:45:000 0 52 2010-1-1 12:00:000 - 2010-1-1 12:45:000 0 36 2010-1-1 13:00:000 - 2010-1-1 13:45:000 0 27 2010-1-1 15:00:000 - 2010-1-1 15:45:000 0 30 </code></pre> <p>Basically it is calculating the zero and null values per hour. If you want to know more about it this is the link: <a href="https://stackoverflow.com/questions/17327835/sql-programming-combining-4-rows-into-1-and-adding-3-columns">SQL Programming combining 4 rows into 1 and adding 3 columns</a></p> <p>Now, I just want to add another column to that query that would calculate if there are any constant values then just display the number of the constant values (should be between 0 and 3) for example if the value at 2013-05-4 10:30 has the same value at 2013-05-4 10:15 then should be 1 in the ConstantData column. basically, compare the value to the previous value every 15 minutes. </p>
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    1. USNatalia Natalie
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    1. COHow is this different from: your earlier question? [Possible Duplicate](http://stackoverflow.com/questions/17347361/sql-query-compare-values-in-per-15-minutes-and-display-the-result-per-hour)
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    2. COPlease ignore this question! I am working on it. Thank you.
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      1. USNatalia Natalie
 

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