ASCII() method is inverse to the CHAR() and it used for convert the String Expression values into the values into the Meaningful ASCII values in Sql Database Management System. In ASCII() we can pass the String Expression which is converted into the ASCII values that is used in the Sql Query. In that case we can directly pass the String values in the ASCII() function for example SELECT ASCII("SONU") AS asciicode, So that in this expression the String values "SONU" is treated as the ASCII values.