What is the fastest to export output of a storedprocedure to a csv file using PowerShell

There's not much detail in your question, therefore I'll assume you just want to know the PowerShell command to export to CSV

Export-Csv c:\temp

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at the end of your script and change the location to wherever you wish to CSV file to be exported to

I think there have been enough answers already that deserve points rather than just deleting the question.

I think the points should be split:
80% #a42359337
20% #a42359292

Somebody accepted the proposal for the points split as the correct answer! Probably who posted it.

:o)))))