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) 🙂 🙂 🙂
Rent Servers for Income (picks and shovels strategy)