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  1. SQL Command Reference

Cardinality Estimation Functions

pproximate the number of unique elements in a dataset.

APPROX_COUNT_DISTINCT()

Uses HyperLogLog to provide estimate of count distinct

approx_count_distinct(a)
approx_count_distinct(a) over(partition by b)

Limitation -

  • " * " is not supported

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Last updated 10 months ago