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Doc: clarify use of RECURSIVE in WITH.

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Apparently some people misinterpreted the syntax as being that
RECURSIVE is a prefix of individual WITH queries.  It's a modifier
for the WITH clause as a whole, so state that more clearly.

Discussion: https://postgr.es/m/ca53c6ce-a0c6-b14a-a8e3-162f0b2cc119@a-kretschmer.de
This commit is contained in:
Tom Lane 2019-11-19 14:43:37 -05:00
parent 787b3fd33f
commit 5b805886ca
1 changed files with 8 additions and 0 deletions
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doc/src/sgml/ref/select.sgml
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@ -273,6 +273,14 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]
that are earlier in the <literal>WITH</literal> list.
</para>
<para>
When there are multiple queries in the <literal>WITH</literal>
clause, <literal>RECURSIVE</literal> should be written only once,
immediately after <literal>WITH</literal>. It applies to all queries
in the <literal>WITH</literal> clause, though it has no effect on
queries that do not use recursion or forward references.
</para>
<para>
The primary query and the <literal>WITH</literal> queries are all
(notionally) executed at the same time. This implies that the effects of