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how do I efficiently query for unique values of a field #82
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No built-in feature in column for this, but there's 2 ways I can think of to solve this problem:
You can do both during insertion or a range query that iterates over all elements. |
thanks, I went with the second method, but that leaves me with having to do the range query when restoring state from a snapshot :-( |
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say I get a stream of data: {machineCode: "", lat: , lon: }
And I want to display a count of such datums per machineCode.
Is there a way to efficiently get all the unique machine codes? or should I just keep track of them while inserting data?
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