PROCEDURE :

DROP PROCEDURE IF EXISTS `p_terbilang`;
DELIMITER ;;
CREATE PROCEDURE `p_terbilang`(IN angka bigint, OUT retval TEXT)
BEGIN 
  -- @rgiapratama - 2017
	DECLARE tmp1 TEXT;
	DECLARE tmp2 TEXT;
	
	SET max_sp_recursion_depth := 20;

	IF(angka = 0) THEN 
		SET retval = '';
  ELSEIF(angka < 12) THEN 
		SET retval = ELT(angka,'satu','dua','tiga','empat','lima','enam','tujuh','delapan','sembilan','sepuluh','sebelas');
  ELSEIF (angka < 20) THEN
		CALL p_terbilang((angka-10),tmp1);
		SET retval = CONCAT(tmp1,' belas');
  ELSEIF (angka < 100) THEN 
		CALL p_terbilang(FLOOR(angka/10),tmp1);
		CALL p_terbilang((angka%10),tmp2);
		SET retval = CONCAT(tmp1,' puluh ',tmp2);
  ELSEIf (angka < 200) THEN 
		CALL p_terbilang((angka-100),tmp1);
		SET retval = CONCAT('seratus ',tmp1);
  ELSEIF (angka < 1000) THEN
		CALL p_terbilang(FLOOR(angka/100),tmp1);
		CALL p_terbilang((angka%100),tmp2);
		SET retval = CONCAT(tmp1,' ratus ',tmp2);
  ELSEIF (angka < 2000) THEN
		CALL p_terbilang((angka-1000),tmp1);
		SET retval = CONCAT('seribu ',tmp1);
  ELSEIF (angka < 1000000) THEN
		CALL p_terbilang(FLOOR(angka/1000),tmp1);
		CALL p_terbilang((angka%1000),tmp2);
		SET retval = CONCAT(tmp1,' ribu ',tmp2);
  ELSEIF (angka < 1000000000) THEN
		CALL p_terbilang(FLOOR(angka/1000000),tmp1);
		CALL p_terbilang((angka%1000000),tmp2);
		SET retval = CONCAT(tmp1,' juta ',tmp2);
  ELSEIF (angka < 1000000000000) THEN
		CALL p_terbilang(FLOOR(angka/1000000000),tmp1);
		CALL p_terbilang((angka%1000000000),tmp2);
		SET retval = CONCAT(tmp1,' milyar ',tmp2);
  ELSE SET retval = 'GIA';
  END IF;
END
;;
DELIMITER ;

FUNCTION :

DROP FUNCTION IF EXISTS `f_terbilang`;
DELIMITER ;;
CREATE FUNCTION `f_terbilang`(angka BIGINT) RETURNS text CHARSET latin1
BEGIN
-- @rgiapratama - 2017
    DECLARE v_result TEXT;
    CALL p_terbilang(angka, v_result);
    RETURN REPLACE(v_result,'  ',' ');
END
;;
DELIMITER ;

Hasil :

mysql> SELECT f_terbilang(19048500);
+----------------------------------------------------------+
| f_terbilang(19048500)                                    |
+----------------------------------------------------------+
| sembilan belas juta empat puluh delapan ribu lima ratus  |
+----------------------------------------------------------+
1 row in set (0.07 sec)

mysql>