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PostgreSQL documentation
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<para>
To include whitespace into an argument you may quote it with a
single quote. To include a single quote into such an argument,
- precede it by a backslash. Anything contained in single quotes is
+ use two single quotes. Anything contained in single quotes is
furthermore subject to C-like substitutions for
<literal>\n</literal> (new line), <literal>\t</literal> (tab),
<literal>\</literal><replaceable>digits</replaceable> (octal), and