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Document that we don't support ORDER BY with general expressions on

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the output of UNION/INTERSECT/EXCEPT.
This commit is contained in:
Tom Lane 2001-01-08 21:30:37 +00:00
parent 005ad6cdd6
commit 6334ef86a7
1 changed files with 7 additions and 2 deletions
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9
doc/src/sgml/ref/select.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/select.sgml,v 1.35 2000/12/12 05:07:59 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/select.sgml,v 1.36 2001/01/08 21:30:37 tgl Exp $
Postgres documentation
-->
@ -616,7 +616,12 @@ SELECT title, date_prod + 1 AS newlen FROM films ORDER BY newlen;
<programlisting>
SELECT name FROM distributors ORDER BY code;
</programlisting>
A limitation of this feature is that an ORDER BY clause applying to the
result of a UNION, INTERSECT, or EXCEPT query may only specify an output
column name or number, not an expression.
</para>
<para>
Note that if an ORDER BY item is a simple name that matches both
a result column name and an input column name, ORDER BY will interpret
it as the result column name. This is the opposite of the choice that