Number to word Conversion

CREATE FUNCTION fnNumberToWords(@Number as BIGINT)

    RETURNS VARCHAR(1024)

AS

BEGIN

      DECLARE @Below20 TABLE (ID int identity(0,1), Word varchar(32))

      DECLARE @Below100 TABLE (ID int identity(2,1), Word varchar(32))

      INSERT @Below20 (Word) VALUES

                        ( 'Zero'), ('One'),( 'Two' ), ( 'Three'),

                        ( 'Four' ), ( 'Five' ), ( 'Six' ), ( 'Seven' ),

                        ( 'Eight'), ( 'Nine'), ( 'Ten'), ( 'Eleven' ),

                        ( 'Twelve' ), ( 'Thirteen' ), ( 'Fourteen'),

                        ( 'Fifteen' ), ('Sixteen' ), ( 'Seventeen'),

                        ('Eighteen' ), ( 'Nineteen' )

       INSERT @Below100 VALUES ('Twenty'), ('Thirty'),('Forty'), ('Fifty'),

                               ('Sixty'), ('Seventy'), ('Eighty'), ('Ninety')

DECLARE @English varchar(1024) =

(

  SELECT Case

    WHEN @Number = 0 THEN  ''

    WHEN @Number BETWEEN 1 AND 19

      THEN (SELECT Word FROM @Below20 WHERE ID=@Number)

                 WHEN @Number BETWEEN 20 AND 99  

     THEN  (SELECT Word FROM @Below100 WHERE ID=@Number/10)+ '-' +

           dbo.fnNumberToWords( @Number % 10)

   WHEN @Number BETWEEN 100 AND 999  

     THEN  (dbo.fnNumberToWords( @Number / 100))+' Hundred '+

         dbo.fnNumberToWords( @Number % 100)

   WHEN @Number BETWEEN 1000 AND 999999  

     THEN  (dbo.fnNumberToWords( @Number / 1000))+' Thousand '+

                dbo.fnNumberToWords( @Number % 1000) 

   WHEN @Number BETWEEN 1000000 AND 999999999  

     THEN  (dbo.fnNumberToWords( @Number / 1000000))+' Million '+

         dbo.fnNumberToWords( @Number % 1000000)

   WHEN @Number BETWEEN 1000000000 AND 999999999999  

     THEN  (dbo.fnNumberToWords( @Number / 1000000000))+' Billion '+

         dbo.fnNumberToWords( @Number % 1000000000)

   WHEN @Number BETWEEN 1000000000000 AND 999999999999999 

     THEN  (dbo.fnNumberToWords( @Number / 1000000000000))+' Trillion '+

         dbo.fnNumberToWords( @Number % 1000000000000)

  WHEN @Number BETWEEN 1000000000000000 AND 999999999999999999  

     THEN  (dbo.fnNumberToWords( @Number / 1000000000000000))+' Quadrillion '+

         dbo.fnNumberToWords( @Number % 1000000000000000)

  WHEN @Number BETWEEN 1000000000000000000 AND 999999999999999999999  

     THEN  (dbo.fnNumberToWords( @Number / 1000000000000000000))+' Quintillion '+

         dbo.fnNumberToWords( @Number % 1000000000000000000)

        ELSE ' INVALID INPUT' END

)

             

SELECT @English = RTRIM(@English)

SELECT @English = RTRIM(LEFT(@English,len(@English)-1))

                 WHERE RIGHT(@English,1)='-'

RETURN (@English)

END

GO