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Editorial Team
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Asked: 2026-05-26T16:18:03+00:00

I need to Group my Table into 15 minutes Intervals. I can do that

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I need to Group my Table into 15 minutes Intervals. I can do that with:

select dateadd(minute, datediff(minute, 0, ts) / 15 * 15, 0), sum (goodpieces) 
from StationCount 
Group by dateadd(minute, datediff(minute, 0, ts) / 15 * 15, 0)

But to display the returned data in a chart i need to insert also the intervals which don’t have any data and aren’t currently appearing in my select statement. How do i insert these?

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1 Answer

  1. Editorial Team

    Create a table with every possible timestamp in 15 minute increments, and do a LEFT JOIN from it to your query above.

    SELECT * FROM timestamps LEFT JOIN (SELECT dateadd......) ON timestamps.timestamp = StationCount.ts

    If you know your chart always covers a 24 hour period, you only need to create a table with the numbers 0-95, then for each entry add it to the start time of your chart.

    SELECT *
  FROM (SELECT dateadd(minute, <starttime>, number*15) timestamp FROM numbers) timestamps LEFT JOIN
       (SELECT dateadd......) ON timestamps.timestamp = StationCount.ts
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