1. Create a survey
2. Submit a survey
3. Click on the "Survey" tab in admin ( link: /survey/list/ ) 
4. Click the "Results" icon on the left ( link: /survey/result/58/182/eng-GB )
5. Click the "All evaluations" tab

Warning: PHP: E_WARNING 	Feb 03 2012 15:31:29
pg_query(): Query failed: ERROR:  column "ezsurveyresult.tstamp" must appear in the GROUP BY clause or be used in an aggregate function
LINE 6: ...                  language_code='eng-GB' ORDER BY ezsurveyre...
                                                             ^ in /var/www/ezp/.run/lib/ezdb/classes/ezpostgresqldb.php on line 202

Error: eZPostgreSQLDB 	Feb 03 2012 15:31:29
Error: error executing query: SELECT count( ezsurveyresult.id ) as count FROM
                         ezsurveyresult, ezsurvey WHERE
                         ezsurveyresult.survey_id=ezsurvey.id AND
                         contentclassattribute_id='182' AND
                         contentobject_id='58' AND
                         language_code='eng-GB' ORDER BY ezsurveyresult.tstamp DESC: ERROR:  column "ezsurveyresult.tstamp" must appear in the GROUP BY clause or be used in an aggregate function
LINE 6: ...                  language_code='eng-GB' ORDER BY ezsurveyre...
                                                             ^