add 'StartVal' as an aggregationMode to system.tag.queryTagHistory
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jfingerson
Its very useful to get the the StartVal, Minimum, Maximum, and LastVal for a time period - for a chemical tank you can calculate additions versus usage - its possible to retrieve with a separate query, but it would be much more straightforward to have that built-in.
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A
Anthony Ho
It already had Minimum, Maximum, and LastValue. So it is missing FirstValue. It is nice to have when I am looking for the first change.
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Jonathan Espín Martin
When using time intervals, having the aggregatioMode "FirstValue" would be useful.