From: Bruce Momjian <bruce@momjian.us>
Date: Sat, 21 Dec 2019 17:44:38 +0000 (-0500)
Subject: docs:  clarify handling of column lists in COPY TO/FROM
X-Git-Tag: REL9_4_26~34
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=530b5d53f67262c5e092f8b82aa8e34f54e7e68f;p=thirdparty%2Fpostgresql.git

docs:  clarify handling of column lists in COPY TO/FROM

Previously it was unclear how COPY FROM handled cases where not all
columns were specified, or if the order didn't match.

Reported-by: pavlo.golub@gmail.com

Discussion: https://postgr.es/m/157487729344.7213.14245726713444755296@wrigleys.postgresql.org

Backpatch-through: 9.4
---

diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml
index 7ca663f925f..c75e25c632e 100644
--- a/doc/src/sgml/ref/copy.sgml
+++ b/doc/src/sgml/ref/copy.sgml
@@ -61,11 +61,11 @@ COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable
   </para>
 
   <para>
-   If a list of columns is specified, <command>COPY</command> will
-   only copy the data in the specified columns to or from the file.
-   If there are any columns in the table that are not in the column list,
-   <command>COPY FROM</command> will insert the default values for
-   those columns.
+   If a column list is specified, <command>COPY TO</command> copies only
+   the data in the specified columns to the file.  For <command>COPY
+   FROM</command>, each field in the file is inserted, in order, into the
+   specified column.  Table columns not specified in the <command>COPY
+   FROM</command> column list will receive their default values.
   </para>
 
   <para>