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PostgreSQL documentation

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<entry><type>text</type></entry>

<entry>

Remove the longest string consisting only of characters

in <parameter>characters</parameter> (or spaces if not supplied)

in <parameter>characters</parameter> (a space by default)

from the start and end of <parameter>string</parameter>.

</entry>

<entry><literal>btrim('xyxtrimyyx', 'xy')</literal></entry>