mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-03 08:00:21 +08:00
Document that we don't support ORDER BY with general expressions on
the output of UNION/INTERSECT/EXCEPT.
This commit is contained in:
parent
005ad6cdd6
commit
6334ef86a7
@ -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
|
||||
|
Loading…
Reference in New Issue
Block a user