LEAST
The LEAST function returns the smallest expression in a list of expressions. All expressions after the first are implicitly converted to the data type of the first expression before the comparison.
To retrieve the largest expression in a list of expressions, use GREATEST.
Return Value
The data type of the first expression.
Syntax
LEAST (expr [, expr]...)
Arguments
 expr

An expression.
Examples
Example 87 Finding the the Text Expression that is First Alphabetically
The following statement returns the string that is first in alphabetic sequence.
SHOW LEAST('Harry','Harriot','Harold')
Harold
Example 88 Finding the Smallest Numerical Expressions
The following statement selects the number with the smallest value.
SHOW LEAST (5, 3, 18)
3