[Zope] ZSQL subselect P

[Lee Marzke]

Hi,

I'm trying to use a subquery with the following SQL syntax and get an error.

SELECT * from return WHERE requestid = ( SELECT requestid from return ORDER BY
requestid LIMIT 1 )

Each part of the queary works seperatly but not together.  Are their limitation
on SQL statements that are allowed ?


Using Zope 2.3.0 and 
PostgresSQL 7.0.3
ZPoPyDA-1.2.tar.gz
PoPy-2.0.2.tar.gz

Trace follows:
================================================

Error, PoPy.ProgrammingError: ERROR: parser: parse error at or near "order" 

SQL used:

SELECT * from return WHERE requestid=( SELECT requestid from return ORDER BY
requestid
LIMIT 1 )


Traceback (innermost last):
  File /sw/scm/usr/var/Zope230/lib/python/ZPublisher/Publish.py, line 222, in
publish_module
  File /sw/scm/usr/var/Zope230/lib/python/ZPublisher/Publish.py, line 187, in
publish
  File /sw/scm/usr/var/Zope230/lib/python/Zope/__init__.py, line 221, in
zpublisher_exception_hook
    (Object: top_1)
  File /sw/scm/usr/var/Zope230/lib/python/ZPublisher/Publish.py, line 171, in
publish
  File /sw/scm/usr/var/Zope230/lib/python/ZPublisher/mapply.py, line 160, in
mapply
    (Object: manage_test)
  File /sw/scm/usr/var/Zope230/lib/python/ZPublisher/Publish.py, line 112, in
call_object
    (Object: manage_test)
  File /sw/scm/usr/var/Zope230/lib/python/Shared/DC/ZRDB/DA.py, line 396, in
manage_test
    (Object: top_1)
  File /sw/scm/usr/var/Zope230/lib/python/Shared/DC/ZRDB/DA.py, line 374, in
manage_test
    (Object: top_1)
  File /sw/scm/usr/var/Zope230/lib/python/Shared/DC/ZRDB/DA.py, line 489, in
__call__
    (Object: top_1)
  File /sw/scm/usr/var/Zope230/lib/python/Products/ZPoPyDA/PoPy_db.py, line 95,
in query
ProgrammingError: (see above)