I am a beginner in SQL Functions. What is the best way to create a function for factorial in SQL Server- Say 10!
Here is a recursive solution:
CREATE FUNCTION dbo.Factorial ( @iNumber int )
RETURNS INT
AS
BEGIN
DECLARE @i int
IF @iNumber <= 1
SET @i = 1
ELSE
SET @i = @iNumber * dbo.Factorial( @iNumber - 1 )
RETURN (@i)
END
A non recursive way
;With Nums As
(
select ROW_NUMBER() OVER (ORDER BY (SELECT 0)) AS RN
FROM sys.objects
)
SELECT POWER(10.0, SUM(LOG10(RN)))
FROM Nums
WHERE RN <= 10
And a recursive way
declare @target int
set @target=10;
WITH N AS
(SELECT 1 AS i,
1 AS f
UNION ALL
SELECT i+1,
f*(i+1)
FROM N
WHERE i < @target
)
SELECT f FROM N
WHERE i=@target
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