Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# Literals
<a name="r_Literals"></a>

A literal or constant is a fixed data value, composed of a sequence of characters or a numeric constant. Amazon Redshift supports several types of literals, including:
+ Numeric literals for integer, decimal, and floating-point numbers. For more information, see [Integer and floating-point literals](r_numeric_literals201.md).
+ Character literals, also referred to as strings, character strings, or character constants
+ Datetime and interval literals, used with datetime data types. For more information, see [Date, time, and timestamp literals](r_Date_and_time_literals.md) and [Interval data types and literals](r_interval_data_types.md).