Number To Word in oracle

 How can you convert a number into words using Oracle Sql Query? What I mean by Number to Word is:

12 = Twelve
102 = One Hundred Two
1020 = One Thousand Twenty

Here’s a classy query which will convert number into words.Please see the query below:

select to_char(to_date(:number,'j'),'jsp') from dual;

If I pass 234 in number, then the output will : two hundred thirty-four

SELECT TO_CHAR (TO_DATE (234, 'j'), 'jsp') FROM DUAL;
//Output: two hundred thirty-four

SELECT TO_CHAR (TO_DATE (24834, 'j'), 'jsp') FROM DUAL;
//Output: twenty-four thousand eight hundred thirty-four

SELECT TO_CHAR (TO_DATE (2447834, 'j'), 'jsp') FROM DUAL;
//Output: two million four hundred forty-seven thousand eight hundred thirty-four

So how the query works? Well here’s why:
If you look into the inner most part of the query to_date(:number,'j') the ‘j’ or J is the Julian Date (January 1, 4713 BC), basically this date is been used for astronomical studies.
So to_date(:number,'j') it take the number represented by number and pretend it is a julian date, convert into a date.
If you pass 3 to number, so it will convert date to 3rd Jan 4713 BC, it means 3 is added to the Julian date.
Now to_char(to_date(:number,'j'),'jsp'), jsp = Now; take that date(to_date(:number,'j')) and spell the julian number it represents

Limitation & workaround

There is a limitation while using Julian dates ,It ranges from 1 to 5373484. That’s why if you put the values after 5373484, it will throw you an error as shown below:

ORA-01854: julian date must be between 1 and 5373484

To cater the above problem ,create a function ,and with little trick with j->jsp ,you can fetch the desired result.

CREATE OR REPLACE FUNCTION spell_number (p_number IN NUMBER)
   RETURN VARCHAR2
AS
   TYPE myArray IS TABLE OF VARCHAR2 (255);

   l_str myArray
         := myArray ('',
                     ' thousand ',
                     ' million ',
                     ' billion ',
                     ' trillion ',
                     ' quadrillion ',
                     ' quintillion ',
                     ' sextillion ',
                     ' septillion ',
                     ' octillion ',
                     ' nonillion ',
                     ' decillion ',
                     ' undecillion ',
                     ' duodecillion ');

   l_num      VARCHAR2 (50) DEFAULT TRUNC (p_number);
   l_return   VARCHAR2 (4000);
BEGIN
   FOR i IN 1 .. l_str.COUNT
   LOOP
      EXIT WHEN l_num IS NULL;

      IF (SUBSTR (l_num, LENGTH (l_num) - 2, 3) <> 0)
      THEN
         l_return :=
            TO_CHAR (TO_DATE (SUBSTR (l_num, LENGTH (l_num) - 2, 3), 'J'),
                     'Jsp')
            || l_str (i)
            || l_return;
      END IF;

      l_num := SUBSTR (l_num, 1, LENGTH (l_num) - 3);
   END LOOP;

   RETURN l_return;
END;
/


SELECT spell_number (53734555555585) FROM DUAL;