.. highlightlang:: us

.. _st_union:

ST_union
========

.. index:: ST_union

.. us.tag  ST_union NOTREADYENGLISH STR New300

:ref:`ST_union`

.. function::  c = ST_union(a, b)

.. us.return

**Return Value**

*c*.

.. us.params

**Parameters**

.. uparam:: a

   *a* is a string or real matrix.

.. uparam:: b

   *b* is a string or real matrix.

.. us.example

**Example**

::

   * ST_union([2,3,2,5], [2,4,9])
   *    2.000    3.000   2.000  5.000  2.000  4.000  9.000
   *
   * ST_union(["one", "two", "three"], ["two", "four", "five"])'
   one
   two
   three
   two
   four
   five

.. seealso::
   :ref:`overview-strings`,
   :ref:`ST_complement`,
   :ref:`ST_intersection`,
   :ref:`ST_set`

:sub:`id-858391`