.. _auto_dataset_unique:

*CHECKS DATASET FOR UNIQUE COLUMN NAME*
=======================================

Extracts all unique values from a specified column in a dataset. Use this worker to deduplicate a column and obtain its distinct value set for downstream filtering, validation, or enumeration tasks.

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

Classification: **process**.

Tagged: ``column``, ``dataset``, ``deduplicate``, ``distinct``, ``transform``, ``unique``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Dataset Name
     - datasetname
     - dataset
     - —
     - 
     - The input dataset to inspect; must contain the column specified in `column_name`.
   * - Column Name
     - column_name
     - scalar
     - —
     - 
     - Name of the column whose values will be deduplicated; provide as a quoted string matching the exact column header in the dataset.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - dataset_unique_output_1
     - dataset_unique_output_1
     - set
     - An ordered set (array) of distinct values found in the specified column, with duplicates removed.

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

- data.dataset.transform

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

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

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>dataset_unique</code>. Schema hash: <code>5a1da8d6a231</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>