COUNTD

Syntax

COUNTD( value )

COUNTD( value
        [ FIXED ... | INCLUDE ... | EXCLUDE ... ]
        [ BEFORE FILTER BY ... ]
      )

More info:

Description

Returns the number of unique values in the group.

See also COUNTD_APPROX.

Argument types:

  • value — Any

Return type: Integer

Example

COUNTD([ClientID])

Data source support

ClickHouse 19.13, Microsoft SQL Server 2017 (14.0), MySQL 5.6, PostgreSQL 9.3.

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