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Doc: improve documentation about random().

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We didn't explicitly say that random() uses a randomly-chosen seed
if you haven't called setseed().  Do so.

Also, remove ref/set.sgml's no-longer-accurate (and never very
relevant) statement that the seed value is multiplied by 2^31-1.

Back-patch to v12 where set.sgml's claim stopped being true.
The claim that we use a source of random bits as seed was debatable
before 4203842a1, too, so v12 seems like a good place to stop.

Per question from Carl Sopchak.

Discussion: https://postgr.es/m/f37bb937-9d99-08f0-4de7-80c91a3cfc2e@sopchak.me
This commit is contained in:
Tom Lane
2022-07-23 19:00:29 -04:00
parent e757cdd6ad
commit 6955bba0ed
2 changed files with 4 additions and 2 deletions
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doc/src/sgml/ref/set.sgml
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@@ -177,8 +177,7 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="parameter">timezone</rep
<para>
Sets the internal seed for the random number generator (the
function <function>random</function>). Allowed values are
floating-point numbers between -1 and 1, which are then
multiplied by 2<superscript>31</superscript>-1.
floating-point numbers between -1 and 1 inclusive.
</para>
<para>