Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025.
If you would like to use Python UDFs, create the UDFs prior to that date.
Existing Python UDFs will continue to function as normal. For more information, see the
blog post
GREATEST and LEAST functions
Returns the largest or smallest value from a list of any number of expressions.
Syntax
GREATEST (value [, ...]) LEAST (value [, ...])
Parameters
- expression_list
-
A comma-separated list of expressions, such as column names. The expressions must all be convertible to a common data type. NULL values in the list are ignored. If all of the expressions evaluate to NULL, the result is NULL.
Returns
Returns the greatest (for GREATEST) or least (for LEAST) value from the provided list of expressions.
Example
The following example returns the highest value alphabetically for
firstname or lastname.
select firstname, lastname, greatest(firstname,lastname) from users where userid < 10 order by 3; firstname | lastname | greatest -----------+-----------+----------- Lars | Ratliff | Ratliff Reagan | Hodge | Reagan Colton | Roy | Roy Barry | Roy | Roy Tamekah | Juarez | Tamekah Rafael | Taylor | Taylor Victor | Hernandez | Victor Vladimir | Humphrey | Vladimir Mufutau | Watkins | Watkins (9 rows)
