Example of wrong results from modulo operation of arbitrary precision
numbers:
# select '123456789012345678901234567890'::numeric % 123;
?column?
----------
-6
(1 row)
# select mod('123456789012345678901234567890'::numeric, 123);
mod
-----
-6
(1 row)
The correct result (at least according to another, unnamed, RDBMS):
> select '123456789012345678901234567890' % 123;
+----------------------------------------+
| '123456789012345678901234567890' % 123 |
+----------------------------------------+
| 58 |
+----------------------------------------+
1 row in set (0.00 sec)
Bruno Wolff III wrote:
On Mon, Apr 26, 2004 at 10:18:52 -0400,
Chadwick Boggs <[EMAIL PROTECTED]> wrote:
I need to perform modulo operations on extremely large numbers. The %
operator is giving me number out of range errors and the mod(x, y)
function simply seems to return the wrong results. Also, my numerator
is in the format of a quoted string, which the mod function can't take.
How large is extremely large?
You can cast the strings to a numeric type to solve the string problem.
'numeric' should work for numbers up to about 1000 digits.
For example:
area=> select '1234567890'::numeric % '123'::numeric;
?column?
----------
39
(1 row)
If you are getting wrong results you should post a specific example so
that the developers can figure out what is going wrong.
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