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Thanks to your PQ course , I've managed to set up a filter to discard the unwanted data before the processing stage - now much quicker. I have to use ...

Thanks Mynda. Actually I had not considered incremental refresh, but filtering out the data rows I already had before performing all the processing (w...

Catalin, thank you so much for this! Perfect and almost instantaneous!

Hi Catalin, the two source csv files are an hourly record of heat output and electrican input. But the values of heat and electricity are cumulative ...