Index: copy.sgml
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RCS file: /cvsroot/pgsql/doc/src/sgml/ref/copy.sgml,v
retrieving revision 1.87
diff -c -r1.87 copy.sgml
*** copy.sgml	5 Sep 2009 23:58:01 -0000	1.87
--- copy.sgml	17 Sep 2009 21:47:11 -0000
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! $PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.87 2009/09/05 23:58:01 tgl Exp $
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      <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
      use <literal>FORCE NOT NULL</> to prevent <literal>NULL</> input
      comparisons for specific columns.
--- 552,561 ----
      <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</>
!     parameter and is not quoted, while a non-NULL value matching the
!     the <literal>NULL</> parameter string is quoted. Therefore, using the default
      settings, a <literal>NULL</> is written as an unquoted empty
!     string, while an empty string data value is written with double quotes
      (<literal>""</>). Reading values follows similar rules. You can
      use <literal>FORCE NOT NULL</> to prevent <literal>NULL</> input
      comparisons for specific columns.