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Sort of conveniently omits the really tricky bit  the "and" 10129 = ten thousand one hundred and twenty nine
The rules for the "and" are rather complex ... e.g.
101202 = one hundred and one thousand two hundred and two but 100002 = one hundred thousand and two
I did work out the rules some long time ago and have some C++ code that does this
James Horsley Workflow Consulting Limited




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I haven't messed with the AND, but I am concerned about function performance over a large number of rows. I created the function as is on a SQL Server 2005 Developer Edition 64bit, w/SP2 (no CU's), running on Vista Ultimate 64bit with SP1, on an Intel Q9550 QuadCore cpu at 2.83GHz and 8 GB of RAM, with SQL Server limited to 4096MB.
Here's the test code and it's timing:
SET STATISTICS TIME ON SELECT N, N * N AS N_SQUARED, dbo.fnSpellInteger(N * N) AS WORDS FROM dbo.Tally SET STATISTICS TIME OFF
(11000 row(s) affected)
SQL Server Execution Times: CPU time = 13681 ms, elapsed time = 14052 ms.
The dbo.Tally table is just a table of the numbers from 1 to 11000. I then rewrote this function to make use of dbo.Tally, where I expected to improve execution time significantly because the code would then be setbased. Here's the code and the results:
CREATE FUNCTION dbo.fnIntegerInWords ( @number int ) RETURNS varchar(100) AS BEGIN /*  PUT slash asterisk at the beginning of this line, but for testing remove it DECLARE @number int SET @number = 123456789 */  PUT asterisk slash at the beginning of this line, but for testing remove it IF @number < 0 RETURN 'ERROR, NEGATIVE NUMBER USED' IF @number = 0 RETURN 'Zero'
DECLARE @result varchar(100), @cn varchar(12) DECLARE @NUMWORDS TABLE ( Num varchar(2) NOT NULL PRIMARY KEY CLUSTERED, Word varchar(9) ) INSERT INTO @NUMWORDS (Num, Word) SELECT '0', '' UNION ALL SELECT '1', 'One' UNION ALL SELECT '2', 'Two' UNION ALL SELECT '3', 'Three' UNION ALL SELECT '4', 'Four' UNION ALL SELECT '5', 'Five' UNION ALL SELECT '6', 'Six' UNION ALL SELECT '7', 'Seven' UNION ALL SELECT '8', 'Eight' UNION ALL SELECT '9', 'Nine' UNION ALL SELECT '10', 'Ten' UNION ALL SELECT '11', 'Eleven' UNION ALL SELECT '12', 'Twelve' UNION ALL SELECT '13', 'Thirteen' UNION ALL SELECT '14', 'Fourteen' UNION ALL SELECT '15', 'Fifteen' UNION ALL SELECT '16', 'Sixteen' UNION ALL SELECT '17', 'Seventeen' UNION ALL SELECT '18', 'Eighteen' UNION ALL SELECT '19', 'Nineteen' UNION ALL SELECT '2_', 'Twenty' UNION ALL SELECT '3_', 'Thirty' UNION ALL SELECT '4_', 'Forty' UNION ALL SELECT '5_', 'Fifty' UNION ALL SELECT '6_', 'Sixty' UNION ALL SELECT '7_', 'Seventy' UNION ALL SELECT '8_', 'Eighty' UNION ALL SELECT '9_', 'Ninety'
SET @cn = RIGHT('00000000000' + CAST(@number AS VARCHAR(10)),12)  Pad the left with zeros to make the length divisible by 3.
DECLARE @STR TABLE ( RN int IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED, STRING char(3) NOT NULL, WORD AS CAST(CASE RN WHEN 1 THEN ' Billion' WHEN 2 THEN ' Million' WHEN 3 THEN ' Thousand' WHEN 4 THEN '' END AS varchar(9)) )
INSERT INTO @STR (STRING) SELECT SUBSTRING(@cn,T.N,3) AS STRING FROM dbo.Tally AS T WHERE T.N < 11 AND (T.N % 3) = 1
/*  Remove for testing SELECT * FROM @STR */  Remove for testing
SET @result = '' SELECT @result = @result +  FIRST DIGIT OF THREE CASE LEFT(S.STRING,1) WHEN '0' THEN '' ELSE (SELECT Word FROM @NUMWORDS WHERE Num = LEFT(S.STRING,1)) + ' Hundred ' END +  DIGITS TWO AND THREE CASE WHEN RIGHT(S.STRING,2) = '00' THEN '' WHEN RIGHT(S.STRING,2) LIKE '0_' THEN (SELECT Word FROM @NUMWORDS WHERE Num = RIGHT(S.STRING,1)) ELSE (SELECT Word FROM @NUMWORDS WHERE LEN(Num) = 2 AND RIGHT(S.STRING,2) LIKE Num) + CASE WHEN SUBSTRING(S.STRING,2,1) <> '1' AND RIGHT(S.STRING,1) <> '0' THEN '' + (SELECT Word FROM @NUMWORDS WHERE Num = RIGHT(S.STRING,1)) ELSE '' END END +  DIGIT GROUP VALUE CASE WHEN S.STRING = '000' THEN '' ELSE S.WORD END + ' ' FROM @STR AS S RETURN LTRIM(RTRIM(@result))
END GO
SET STATISTICS TIME ON SELECT N, N * N AS N_SQUARED, dbo.fnIntegerInWords(N * N) AS WORDS FROM dbo.Tally SET STATISTICS TIME OFF
(11000 row(s) affected)
SQL Server Execution Times: CPU time = 4992 ms, elapsed time = 5213 ms.
Steve (aka smunson) :):):)
Steve (aka sgmunson)
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Unfortunately, your return string is not quite big enough:
SELECT dbo.fnSpellInteger ( 1999999999 )
Gives me:
One Billion Nine Hundred NinetyNine Million Nine Hundred NinetyNine Thousand Nine Hundred Ninety
The function would be better written to return VARCAHR(MAX)  or at least VARCHAR(112):
SELECT LEN(dbo.fnSpellInteger ( 1777777000 ) + ' ' + dbo.fnSpellInteger ( 777 ))
Of course, it could easily be extended to BIGINT as well :)




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I also found the function to be slow in testing. I had an alternate way of generating the number that was much quicker, but for performance, the best solution I've found so far is to prepopulate a table with the appropriate text for a number and then just join to it. Some sample code for testing follows. It only goes to the thousands, but obviously the approach could be extended further.
I have also had it beaten into my head that, WHENEVER possible, character string manipulation should be done on the application side to keep the load off the SQL Server. Much more scalable.
declare @numwords table(number int, ones varchar(15), tens varchar(15), hundreds varchar(15), thousands varchar(15)) insert into @numwords select 0,NULL,NULL,NULL,NULL union all select 1,'One','Ten','One Hundred','One Thousand' union all select 2,'Two','Twenty','Two Hundred','Two Thousand' union all select 3,'Three','Thirty','Three Hundred','Three Thousand' union all select 4,'Four','Forty','Four Hundred','Four Thousand' union all select 5,'Five','Fifty','Five Hundred','Five Thousand' union all select 6,'Six','Sixty','Six Hundred','Six Thousand' union all select 7,'Seven','Seventy','Seven Hundred','Seven Thousand' union all select 8,'Eight','Eighty','Eight Hundred','Eight Thousand' union all select 9,'Nine','Ninety','Nine Hundred','NineThousand' union all select 10,'Nineteen',NULL,NULL,NULL union all select 11,'Eleven',NULL,NULL,NULL union all select 12,'Twelve',NULL,NULL,NULL union all select 13,'Thirteen',NULL,NULL,NULL union all select 14,'Fourteen',NULL,NULL,NULL union all select 15,'Fifteen',NULL,NULL,NULL union all select 16,'Sixteen',NULL,NULL,NULL union all select 17,'Seventeen',NULL,NULL,NULL union all select 18,'Eighteen',NULL,NULL,NULL union all select 19,'Nineteen',NULL,NULL,NULL
set statistics time on; with expanded as (select N ,max(case when number = substring(reverse(N),4,1) then thousands else '' end) as thousands ,max(case when number = substring(reverse(N),3,1) then hundreds else '' end) as hundreds ,max(case when right(N,2) not between 11 and 19 and number = substring(reverse(N),2,1) then tens else '' end) as tens ,max(case when right(N,2) not between 11 and 19 and number = right(N,1) then ones when right(N,2) between 11 and 19 and number = right(N,2) then ones else '' end) as ones from @Numwords cross join dbo.Tally group by N )
select N,isnull(thousands+' ','')+isnull(hundreds+' ','')+isnull(tens+' ','')+isnull(ones,'') from expanded where N <= 9999 set statistics time off;
 create a temp table to test lookup create table #numwords (number int primary key, words varchar(200))
;with expanded as (select N ,max(case when number = substring(reverse(N),4,1) then thousands else '' end) as thousands ,max(case when number = substring(reverse(N),3,1) then hundreds else '' end) as hundreds ,max(case when right(N,2) not between 11 and 19 and number = substring(reverse(N),2,1) then tens else '' end) as tens ,max(case when right(N,2) not between 11 and 19 and number = right(N,1) then ones when right(N,2) between 11 and 19 and number = right(N,2) then ones else '' end) as ones from @Numwords cross join dbo.Tally group by N ) insert into #numwords select N,isnull(thousands+' ','')+isnull(hundreds+' ','')+isnull(tens+' ','')+isnull(ones,'') from expanded where N <= 9999
select * from #numwords
set statistics time on;  test using join to existing table select t.N,nw.words from dbo.tally t join #numwords nw on t.N = nw.Number set statistics time off;
 test join with set of 9999 random numbers create table #testSet (testnum int) insert into #testset select ABS(CHECKSUM(NEWID())) % 9998 + 1 from dbo.tally where N < 10000
set statistics time on;  test using join to existing table select t.testnum,nw.words from #testSet t join #numwords nw on t.testNum = nw.Number set statistics time off;
set statistics time on;  test using the user function from the article select testnum,dbo.fnSpellInteger(testNum) from #testSet set statistics time off;
drop table #numwords drop table #testSet
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