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.. -*- rst -*-
.. groonga-command
.. database: columns_scalar
Scalar column
=============
Summary
-------
Scalar column is a data store object.
It can store one scalar value per record. Scalar value is one of the
following type values:
* ``Bool``
* ``Int8``
* ``Int16``
* ``Int32``
* ``Int64``
* ``UInt8``
* ``UInt16``
* ``UInt32``
* ``UInt64``
* ``BFloat16``
* ``Float32``
* ``Float``
* ``Time``
* ``ShortText``
* ``Text``
* ``LongText``
* ``TokyoGeoPoint``
* ``WGS84GeoPoint``
If you want to store zero or more values per record, you can use
multiple scalar columns or one :doc:`vector`. If these values are
related and use the same types such as tags (zero or more strings),
:doc:`vector` is suitable. If these values aren't related such as
title and location, multiple scalar columns are suitable.
Usage
-----
See :doc:`../commands/column_create` how to create a column.
There are three scalar column types:
* Normal scalar column
* Reference scalar column
* Generated scalar column
This section describes how to use these types.
.. _normal-scalar-column:
Normal scalar column
^^^^^^^^^^^^^^^^^^^^
TODO
.. _reference-scalar-column:
Reference scalar column
^^^^^^^^^^^^^^^^^^^^^^^
TODO
.. _generated-scalar-column:
Generated scalar column
^^^^^^^^^^^^^^^^^^^^^^^
You can use a scalar column as a :ref:`generated-column`.
How to create
"""""""""""""
See :ref:`column-create-generated-column` for details.
See also
--------
* :doc:`vector`
* :doc:`../commands/column_create`
|
