doc: Add example file for COPY

The paragraph for introducing INSERT and COPY discussed how a file
could be used for bulk loading with COPY, without actually showing
what the file would look like.  This adds a programlisting for the
file contents.

Backpatch to all supported branches since this example has lacked
the file contents since PostgreSQL 7.2.

Author: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: http://postgr.es/m/158017814191.19852.15019251381150731439@wrigleys.postgresql.org
Backpatch-through: 13

diff --git a/doc/src/sgml/query.sgml b/doc/src/sgml/query.sgml
index 727a0cb185fb251b83efc3166f2e5cbbfe0b1cbe..b190f28d41ea67b08bd299f92b8e99ef15355e57 100644 (file)
--- a/doc/src/sgml/query.sgml
+++ b/doc/src/sgml/query.sgml
@@ -264,8 +264,18 @@ COPY weather FROM '/home/user/weather.txt';
 
     where the file name for the source file must be available on the
     machine running the backend process, not the client, since the backend process
-    reads the file directly.  You can read more about the
-    <command>COPY</command> command in <xref linkend="sql-copy"/>.
+    reads the file directly.  The data inserted above into the weather table
+    could also be inserted from a file containing (values are separated by a
+    tab character):
+
+<programlisting>
+San Francisco    46    50    0.25    1994-11-27
+San Francisco    43    57    0.0    1994-11-29
+Hayward    37    54    \N    1994-11-29
+</programlisting>
+
+    You can read more about the <command>COPY</command> command in
+    <xref linkend="sql-copy"/>.
    </para>
   </sect1>