The CHARACTER_LENGTH (CHAR_LENGTH or LENGTH) function calculates
    the length of a value expression of any data type.

    If the result of the value expression is a character data type,
    the CHARACTER_LENGTH function returns the length, in characters,
    of the character string. (Remember that the length of a character
    can be one or more octets.) If the result of the value expression
    is NULL, the function returns a null value. You can use CHAR_
    LENGTH or LENGTH as an alternative for CHARACTER_LENGTH.