mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-12-09 08:10:09 +08:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
doc/src/sgml/ref/select.sgml
View File

@ -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 Postgres documentation
--> -->
@ -616,7 +616,12 @@ SELECT title, date_prod + 1 AS newlen FROM films ORDER BY newlen;
<programlisting> <programlisting>
SELECT name FROM distributors ORDER BY code; SELECT name FROM distributors ORDER BY code;
</programlisting> </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 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 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 it as the result column name. This is the opposite of the choice that