Yandex DataLens

Getting started
Use cases
Step-by-step instructions
Concepts
Access management
- Managing access to DataLens
- Managing access at the data row level (RLS)
Pricing policy
Function reference
- All Functions
- Aggregate functions
- Date/Time functions
- Geographical functions
- Logical functions
  - Overview
  - CASE
  - IF
  - IFNULL
  - ISNULL
  - ZN
- Mathematical functions
  - Overview
  - ABS
  - ACOS
  - ASIN
  - ATAN
  - ATAN2
  - CEILING
  - COS
  - COT
  - DEGREES
  - DIV
  - EXP
  - FLOOR
  - GREATEST
  - LEAST
  - LN
  - LOG
  - LOG10
  - PI
  - POWER
  - RADIANS
  - ROUND
  - SIGN
  - SIN
  - SQRT
  - SQUARE
  - TAN
- Operators
- String functions
- Type conversion functions
- Window functions
- Function Availability

COUNTD_APPROX

Aggregate functions

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.