Counts the approximate number of distinct values in a column. Currently this function is only available on a DirectQuery table from Azure SQL or Azure SQL Data Warehouse.


Parameter Attributes Description

The column for which the distinct values are counted.

Return values

Scalar A single integer value.

The approximate number of distinct values in ColumnName.


The SQL query generated uses the APPROX_COUNT_DISTINCT in Transact-SQL to obtain the result.

Related functions

Other related functions are:

Last update: May 20, 2020   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber

MSDN documentation:

Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.


Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.


This function is deprecated. Jump to the Alternatives section to see the function to use.


This parameter is deprecated and its use is not recommended.


Want to improve the content of APPROXIMATEDISTINCTCOUNT? Did you find any issue?
Please, report it us! All submissions will be evaluated for possible updates of the content.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.