Two scripts to spell out numbers in words

  • Anthony Zackin

    SSC Enthusiast

    Points: 154

    Comments posted to this topic are about the item Two scripts to spell out numbers in words

  • James Horsley

    Hall of Fame

    Points: 3196

    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

  • sgmunson

    SSC Guru

    Points: 110511

    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 64-bit, w/SP2 (no CU's), running on Vista Ultimate 64-bit with SP1, on an Intel Q9550 Quad-Core 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 re-wrote this function to make use of dbo.Tally, where I expected to improve execution time significantly because the code would then be set-based. 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)?:) 🙂 :)?
    Health & Nutrition
    Make Guaranteed Income

  • Tim Wilson-Brown

    Ten Centuries

    Points: 1395

    Unfortunately, your return string is not quite big enough:

    SELECT dbo.fnSpellInteger ( 1999999999 )

    Gives me:

    One Billion Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine 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 🙂

  • The Dixie Flatline

    SSC Guru

    Points: 53253

    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

    __________________________________________________

    Against stupidity the gods themselves contend in vain. -- Friedrich Schiller
    Stop, children, what's that sound? Everybody look what's going down. -- Stephen Stills

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