.. _auto_definetable_get_first_value:

*RETURN THE FIRST VALUE OF THE DEFINE TABLE*
============================================

Extracts and returns the first scalar value from a Define Table input. Use this worker when you need to retrieve the leading value entry from a key-value/curve-paired table within a workflow.

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

Classification: **process**.

Tagged: ``define_table``, ``first_value``, ``scalar``, ``table_lookup``, ``transformations``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Define Tabel
     - kv1
     - define_table
     - —
     - 
     - The Define Table containing one or more value–curve pairs; the worker reads the first value entry. Optional — if omitted, no output is produced.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - Value
     - value
     - scalar
     - The first scalar value extracted from the Define Table (dimensionless or inherits the table's units); returned as a single numeric scalar.

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=definetable_get_first_value <https://www.d3view.com/api/workflow/example?id=definetable_get_first_value>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>definetable_get_first_value</code>. Schema hash: <code>f958ad9a99d4</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>