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Postgres documentation
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<listitem>
<para>
A string to represent NULL values. The default is
- <quote><literal>\N</literal></quote> (backslash-N), for historical
- reasons. You might prefer an empty string, for example.
+ <quote><literal>\N</literal></quote> (backslash-N).
+ You might prefer an empty string, for example.
</para>
<note>
<para>