On 2023-12-21 00:06:39 -0600, Phillip Diffley wrote:
> Postgres's random() function generates a random double. That can be converted
> to a random int for smaller integers, but a double can't represent all of the
> values in a bigint. Is there a recommended way to generate a random bigint in
> Postgres?
Call random() twice and add the results?
Like this:
select (random() * 2147483648)::int8 * 4294967296
+ (random() * 4294967296)::int8;
(This assumes that random() actually returns at least 32 random bits.
If that's not the case you'll need more calls to random())
hp
--
_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@xxxxxx | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"
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