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Doc: explain that "timestamp - timestamp" applies justify_hours().
Back-patch to v13; before that, there's not really space for this kind of detail. Discussion: https://postgr.es/m/c1696f68-fa8d-7759-6a9c-eb293ab1bbc9@gmx.net
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doc/src/sgml/func.sgml

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@@ -8412,11 +8412,12 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
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<returnvalue>interval</returnvalue>
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</para>
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<para>
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Subtract timestamps
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Subtract timestamps (converting 24-hour intervals into days,
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similarly to <function>justify_hours()</function>)
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</para>
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<para>
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<literal>timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'</literal>
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<returnvalue>1 day 15:00:00</returnvalue>
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<literal>timestamp '2001-09-29 03:00' - timestamp '2001-07-27 12:00'</literal>
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<returnvalue>63 days 15:00:00</returnvalue>
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</para></entry>
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</row>
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