COUNTD
Syntax
Standard
Extended
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 21.8, Microsoft SQL Server 2017 (14.0), MySQL 5.7, Oracle Database 12c (12.1), PostgreSQL 9.3, YDB.