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Non-extensive measures e.g. COUNT DISTINCT #31

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danfrankj opened this issue Jan 15, 2022 · 0 comments
Open

Non-extensive measures e.g. COUNT DISTINCT #31

danfrankj opened this issue Jan 15, 2022 · 0 comments

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@danfrankj
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Given an input "transaction fact" containing one row per transaction, compute "transacting users by day".

In SQL this might accomplished via

SELECT 
  COUNT(DISTINCT user_id)
  , ts::DAY
FROM transaction_fct
GROUP BY 
  ts::DAY

In particular to compute this we need not join any table containing all users as this may be quite expensive.

Potentially related to #30
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@danfrankj