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:

    • valueAny

    Return type: Integer

    Example

    COUNTD([ClientID])
    

    Data source support

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