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PostgreSQL documentation

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You can specify an optional second argument, if it is provided it

may be either <literal>on</literal> or <literal>off</literal>

which will enable or disable display of a locale-aware character

toseperate groups of digits to the left of the decimal marker. If

toseparate groups of digits to the left of the decimal marker. If

the second argument is not provided then we will toggle between

on and off.

</para>