UPPER
Returns a character expression with lowercase character data converted to uppercase.
Syntax
UPPER ( character_expression )
Arguments
character_expression
Is an expression of character data. character_expression can be a constant, variable, or column of either character or binary data.
character_expression must be of a data type that is implicitly convertible to varchar. Otherwise, use CAST to explicitly convert character_expression.
Return types
varchar or nvarchar
Examples
SELECT UPPER('upper');