COUNTD_APPROX
Syntax
COUNTD_APPROX( value )
Description
Returns the approximate number of unique values in the group. Faster than COUNTD, but doesn't guarantee accuracy.
Argument types:
value
—Any
Return type: Number (whole)
Examples
COUNTD_APPROX([ClienID])
Data source support
Materialized Dataset
, ClickHouse 1.1
, Oracle Database 12c (12.1)
.