Cleanup/remove/update references to OID column

Cleanup/remove/update references to OID column...

..in wake of 578b229718e8f.

See also
93507e67c9ca54026019ebec3026de35d30370f9
1464755fc490a9911214817fe83077a3689250ab
---
doc/src/sgml/ddl.sgml | 9 ++++-----
doc/src/sgml/ref/insert.sgml | 12 +++++-------
doc/src/sgml/ref/psql-ref.sgml | 3 +++
3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 9e761db..db044c5 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3672,11 +3672,10 @@ VALUES ('Albany', NULL, NULL, 'NY');
<para>
Partitions cannot have columns that are not present in the parent. It
is not possible to specify columns when creating partitions with
- <command>CREATE TABLE</command>, nor is it possible to add columns to
- partitions after-the-fact using <command>ALTER TABLE</command>. Tables may be
- added as a partition with <command>ALTER TABLE ... ATTACH PARTITION</command>
- only if their columns exactly match the parent, including any
- <literal>oid</literal> column.
+ <command>CREATE TABLE</command>, to add columns to
+ partitions after-the-fact using <command>ALTER TABLE</command>, nor to
+ add a partition with <command>ALTER TABLE ... ATTACH PARTITION</command>
+ if its columns would not exactly match those of the parent.
</para>
</listitem>

diff --git a/doc/src/sgml/ref/insert.sgml b/doc/src/sgml/ref/insert.sgml
index 62e142f..3e1be4c 100644
--- a/doc/src/sgml/ref/insert.sgml
+++ b/doc/src/sgml/ref/insert.sgml
@@ -552,13 +552,11 @@ INSERT INTO <replaceable class="parameter">table_name</replaceable> [ AS <replac
INSERT <replaceable>oid</replaceable> <replaceable class="parameter">count</replaceable>
</screen>
The <replaceable class="parameter">count</replaceable> is the
- number of rows inserted or updated. If <replaceable
- class="parameter">count</replaceable> is exactly one, and the
- target table has OIDs, then <replaceable
- class="parameter">oid</replaceable> is the <acronym>OID</acronym>
- assigned to the inserted row. The single row must have been
- inserted rather than updated. Otherwise <replaceable
- class="parameter">oid</replaceable> is zero.
+ number of rows inserted or updated.
+ <replaceable>oid</replaceable> used to be the object ID of the inserted row
+ if <replaceable>rows</replaceable> was 1 and the target table had OIDs, but
+ OIDs system columns are not supported anymore; therefore
+ <replaceable>oid</replaceable> is always 0.
</para>

<para>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 08f4bab..0e6e792 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -3794,6 +3794,9 @@ bar
command. This variable is only guaranteed to be valid until
after the result of the next <acronym>SQL</acronym> command has
been displayed.
+ <productname>PostgreSQL</productname> servers since version 12 do not
+ support OID system columns in user tables, and LASTOID will always be 0
+ following <command>INSERT</command>.
</para>
</listitem>
</varlistentry>
--
2.1.4