Formula has different results in SQL

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Formula has different results in SQL

Author

Topic

Crotalus
Starting Member

16 Posts

Posted - 2008-01-09 : 12:44:18

I use this formula in access, vb and excel to calculate the antilog of a number, but it doesn't work at all in SQL.

10^(Y/10)=Z

For example
in access, 10^(22/10) = 158.489319246111
in SQL, 10^(22/10) = 8

any ideas on how to make it work in SQL?

Thanks,
Ron

jezemine
Master Smack Fu Yak Hacker

2886 Posts

Posted - 2008-01-09 : 12:51:50

select power(10.0,(22.0/10.0))

elsasoft.org

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-01-09 : 12:53:54

Try POWER(10.0,(22.0/10.0))

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-01-10 : 02:08:07

This would explain the reason
select 22/10 as only_integer_part, 22.0/10 as exact_value

and if you used variables then you need to multiply it by 1.0

Declare @n1 int, @n2 int
select @n1=22,@n2=10
select @n1/@n2 as only_integer_part, @n1*1.0/@n2 as exact_value

Madhivanan

Failing to plan is Planning to fail

Crotalus
Starting Member

16 Posts

Posted - 2008-01-10 : 10:03:58

Thanks for the replies. I did try that "power" formula once before and it didn't work either. But I did get it to work with this:

EXP(Convert(real,Y)/10*LOG(10))

I don't know why that works, but it seems that it is very important for "Y" to be a real number.

The "power" formula might work as well, once I convert Y to real.

Ron

jezemine
Master Smack Fu Yak Hacker

2886 Posts

Posted - 2008-01-10 : 10:51:26

incidentally, the reason ^ wasn't working for you is because it has a different meanign in t-sql. it's the bitwise xor operator.

http://msdn2.microsoft.com/en-us/library/ms190277.aspx

elsasoft.org

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-01-11 : 01:28:54

<<
but it seems that it is very important for "Y" to be a real number.
>>

Yes as I explained

Madhivanan

Failing to plan is Planning to fail

Jeff Moden
Aged Yak Warrior

652 Posts

Posted - 2008-01-12 : 21:38:52

The symbol "^" does NOT mean raise to a power in SQL Server... it means XOR

--Jeff Moden

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