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Commit 1b5a004

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bmomjianbmomjian
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doc: mention GROUP BY columns can reference target col numbers
Reported-by: hape <postgres-hape@gmx.de> Discussion: https://postgr.es/m/168871536004.379168.9352636188330923805@wrigleys.postgresql.org Backpatch-through: 11
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‎doc/src/sgml/ref/select.sgml

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@@ -131,6 +131,9 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]
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eliminates groups that do not satisfy the given condition. (See
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<xref linkend="sql-groupby"/> and
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<xref linkend="sql-having"/> below.)
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Although query output columns are nominally computed in the next
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step, they can also be referenced (by name or ordinal number)
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in the <literal>GROUP BY</literal> clause.
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</para>
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</listitem>
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