.. _auto_keyvalue_uniquenum:

*COMPUTE THE UNIQUE NUMBER OF OCCURRENCES IN VALUES*
====================================================

Counts the number of unique values present in a specified column of a key-value response object. Use this worker when you need to determine the cardinality (distinct value count) of any field within a key-value dataset.

When to use
-----------

Classification: **process**.

Tagged: ``cardinality``, ``count``, ``distinct``, ``keyvalue``, ``occurrences``, ``process``, ``unique``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Response
     - kv1
     - keyvalue
     - —
     - 
     - Key-value response object whose column values will be analyzed; connect the upstream response or dataset output here.
   * - Column Name
     - column_name
     - scalar
     - —
     - 
     - Name of the column (key) within the key-value object whose unique value count should be computed; must be provided as a quoted string matching an existing key name.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - keyvalue_uniquenum_output_1
     - keyvalue_uniquenum_output_1
     - scalar
     - Scalar integer representing the number of distinct values found in the specified column of the input key-value object.

Disciplines
-----------

- data.dataset.transform
- data.statistics

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=keyvalue_uniquenum <https://www.d3view.com/api/workflow/example?id=keyvalue_uniquenum>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>keyvalue_uniquenum</code>. Schema hash: <code>5838350b8b9f</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>