DISTINCTCOUNT

This section contains reference documentation for the DISTINCTCOUNT function.

Returns the count of distinct row values in a group.

DISTINCTCOUNTHLL()is faster than DISTINCTCOUNT()if data is pre-aggregated at ingestion or aggregated at a server with enough records. This performance improvement increases when comparing large datasets.

If very few records are pre-aggregated, DISTINCTCOUNT()is faster than DISTINCTCOUNTHLL()because the serialized HLL size is larger than sending individual values.

Signature

DISTINCTCOUNT(colName)

Usage Examples

These examples are based on the Batch Quick Start.

select DISTINCTCOUNT(league) AS value
from baseballStats
value

7

select DISTINCTCOUNT(teamID) AS value
from baseballStats
value

149

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