Returns a character string after truncating all trailing spaces.
RTRIM ( 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.
varchar or nvarchar
SELECT RTRIM('Five spaces are at the end of this string. ');