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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2019-11-19 14:43:37 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2019-11-19 14:43:37 -0500 |
| commit | e0457665ccf8052a3ec6d6c37002b81d3b29e235 (patch) | |
| tree | 3646e4d80a2ca160c6157bdcfb23dddd00260bef | |
| parent | ff6de57750828030488901aa19fa1580f0f087d8 (diff) | |
Doc: clarify use of RECURSIVE in WITH.
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
| -rw-r--r-- | doc/src/sgml/ref/select.sgml | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml index 4db8142afaa..c34e3621939 100644 --- a/doc/src/sgml/ref/select.sgml +++ b/doc/src/sgml/ref/select.sgml @@ -282,6 +282,14 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] </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 a data-modifying statement in <literal>WITH</literal> cannot be seen from |