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doc: clarify COPY TO for partitioning/inheritance 

It was not clear how COPY TO behaved with partitioning/inheritance
because the paragraphs were so far apart.  Also reword to simplify.

Discussion: https://postgr.es/m/20201203211723.GR24052@telsasoft.com

Author: Justin Pryzby

Backpatch-through: 10
This commit is contained in:
Bruce Momjian 2020-12-15 19:20:15 -05:00
parent 355f9d2452
commit 48cbed8821
1 changed files with 10 additions and 14 deletions
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24
doc/src/sgml/ref/copy.sgml
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@ -396,10 +396,16 @@ COPY <replaceable class="parameter">count</replaceable>
<title>Notes</title>
<para>
<command>COPY TO</command> can only be used with plain tables, not
with views. However, you can write <literal>COPY (SELECT * FROM
<replaceable class="parameter">viewname</replaceable>) TO ...</literal>
to copy the current contents of a view.
<command>COPY TO</command> can be used only with plain
tables, not views, and does not copy rows from child tables
or child partitions. For example, <literal>COPY <replaceable
class="parameter">table</replaceable> TO</literal> copies
the same rows as <literal>SELECT * FROM ONLY <replaceable
class="parameter">table</replaceable></literal>.
The syntax <literal>COPY (SELECT * FROM <replaceable
class="parameter">table</replaceable>) TO ...</literal> can be used to
dump all of the rows in an inheritance hierarchy, partitioned table,
or view.
</para>
<para>
@ -408,16 +414,6 @@ COPY <replaceable class="parameter">count</replaceable>
<literal>INSTEAD OF INSERT</literal> triggers.
</para>
<para>
<command>COPY</command> only deals with the specific table named;
it does not copy data to or from child tables. Thus for example
<literal>COPY <replaceable class="parameter">table</replaceable> TO</literal>
shows the same data as <literal>SELECT * FROM ONLY <replaceable
class="parameter">table</replaceable></literal>. But <literal>COPY
(SELECT * FROM <replaceable class="parameter">table</replaceable>) TO ...</literal>
can be used to dump all of the data in an inheritance hierarchy.
</para>
<para>
You must have select privilege on the table
whose values are read by <command>COPY TO</command>, and