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doc: Clarify status of SELECT INTO on reference page

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The documentation as well as source code comments weren't entirely
clear whether SELECT INTO was truly deprecated (thus in theory
destined to be removed eventually), or just a less recommended
variant.  After discussion, it appears that other implementations also
use SELECT INTO in direct SQL in a way similar to PostgreSQL, so it
seems worth keeping it for compatibility.  Update the language in the
documentation to that effect.

Discussion: https://www.postgresql.org/message-id/flat/96dc0df3-e13a-a85d-d045-d6e2c85218da%40enterprisedb.com
This commit is contained in:
Peter Eisentraut 2021-01-30 11:05:15 +01:00
parent 6aaaa76bb4
commit 6533062244
1 changed files with 5 additions and 3 deletions
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doc/src/sgml/ref/select_into.sgml
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@ -138,9 +138,11 @@ SELECT * INTO films_recent FROM films WHERE date_prod >= '2002-01-01';
in <application>ECPG</application> (see <xref linkend="ecpg"/>) and in <application>ECPG</application> (see <xref linkend="ecpg"/>) and
<application>PL/pgSQL</application> (see <xref linkend="plpgsql"/>). <application>PL/pgSQL</application> (see <xref linkend="plpgsql"/>).
The <productname>PostgreSQL</productname> usage of <command>SELECT The <productname>PostgreSQL</productname> usage of <command>SELECT
INTO</command> to represent table creation is historical. It is INTO</command> to represent table creation is historical. Some other SQL
best to use <command>CREATE TABLE AS</command> for this purpose in implementations also use <command>SELECT INTO</command> in this way (but
new code. most SQL implementations support <command>CREATE TABLE AS</command>
instead). Apart from such compatibility considerations, it is best to use
<command>CREATE TABLE AS</command> for this purpose in new code.
</para> </para>
</refsect1> </refsect1>