count_distinct¶

Description¶

Estimate the approximate number of distinct values in the input using hyper-log-log.

(This is less precise, but faster than count_distinct_exact).

int64

This is an aggregate function (aggregates rows over a group in aggregate verbs.)

This is a window function (calculates over a group of multiple input rows using windowing.)

count_distinct(item_1, item_2, ...)

Argument	Type	Optional	Repeatable	Restrictions
item	storable	no	yes	none

countdistinct (deprecated)