Sql function... factorial

Hi experts,
i need a sql function which returns all the factorial of all the prime numbers less than 5. It should return the prime number and also the factorial of the prime number in two columns.

thanks,
Abhinay
LVL 9
abhinayp86Asked:
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dqmqCommented:
Select 1 prime,1 factorial union select 2,3 union select 3,6
SharathData EngineerCommented:

Create two functions for Factorial and Prime Number like this.
CREATE function FACT(@n bigint)
--Returns the factorial of a number.
returns bigint
as
BEGIN
    declare @temp bigint
    if (@n <= 1)
 select @temp = 1
    else
        select @temp = @n * dbo.FACT(@n - 1)
    return @temp
END
GO

CREATE function ISPRIME(@i INT )
--Returns true if the number is prime.
returns bit
as
BEGIN
DECLARE @c int, @t int, @result bit
SET @result=1
IF (@i & 1)=0
 BEGIN
 SET @result=0
 GOTO done
 END
SET @c=3
SET @t=SQRT(@i)
WHILE @c<=@t
 BEGIN
 IF @i % @c=0
  BEGIN
  SET @result=0
  GOTO done
  END
 SET @c=@c+2
 END
done:
RETURN  @result
END
GO

Then use the above created functions like this.
declare @int
set @int = 2
while @int < 5
begin
select @int as number,dbo.Fact(@int) as Factorial where dbo.IsPrime(@int) = 1
end

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Microsoft SQL Server 2008

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