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doc: Document factorial function

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This has existed for a very long time, equivalent to the ! and !!
operators, but it was never documented.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/6ce1df0e-86a3-e544-743a-f357ff663f68%402ndquadrant.com
This commit is contained in:
Peter Eisentraut 2020-06-15 08:51:46 +02:00
parent 3f5863e156
commit 4c5cf54314
1 changed files with 17 additions and 0 deletions
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17
doc/src/sgml/func.sgml
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@ -1347,6 +1347,23 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>factorial</primary>
</indexterm>
<function>factorial</function> ( <type>bigint</type> )
<returnvalue>numeric</returnvalue>
</para>
<para>
Factorial
</para>
<para>
<literal>factorial(5)</literal>
<returnvalue>120</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>