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) 