From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 17 Sep 2009 21:13:01 +0000 (+0000)
Subject: CVS NULL Documentation
X-Git-Tag: REL9_0_0~1583
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=41a40fe4a2acc1256556754228a650610dbffa42;p=pg-rex%2Fsyncrep.git

CVS NULL Documentation

Clearify documentation of CVS's output of NULL values, per suggestion
from Magnus.

Backpatch to 8.4.X.
---

diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml
index 8ab9ff7eca..ff91ee2d9f 100644
--- a/doc/src/sgml/ref/copy.sgml
+++ b/doc/src/sgml/ref/copy.sgml
@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.87 2009/09/05 23:58:01 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.88 2009/09/17 21:13:01 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -550,13 +550,10 @@ COPY <replaceable class="parameter">count</replaceable>
    <para>
     The <literal>CSV</> format has no standard way to distinguish a
     <literal>NULL</> value from an empty string.
-    <productname>PostgreSQL</>'s <command>COPY</> handles this by
-    quoting. A <literal>NULL</> is output as the <literal>NULL</>
-    string and is not quoted, while a data value matching the
-    <literal>NULL</> string is quoted. Therefore, using the default
-    settings, a <literal>NULL</> is written as an unquoted empty
-    string, while an empty string is written with double quotes
-    (<literal>""</>). Reading values follows similar rules. You can
+    <productname>PostgreSQL</>'s <command>COPY</> handles this using
+    quoting. A <literal>NULL</> is output as an empty string without
+    quotes, while an empty string data value is double-quoted
+    (<literal>""</>).  Reading values follows similar rules. You can
     use <literal>FORCE NOT NULL</> to prevent <literal>NULL</> input
     comparisons for specific columns.
    </para>