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Amazon Redshift
Database Developer Guide (API Version 2012-12-01)

GREATEST and LEAST

Returns the largest or smallest value from a list of any number of expressions.

Syntax

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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 data type of the expressions.

Example

The following example returns the highest value alphabetically for firstname or lastname.

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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)