all_vw is a merge table with three tables all with identical structure intraday history currentyear --------------------------------------------------------------------------------------------- My merge tables do not return consistent results I have tried to refresh statistics ANALYZE sys. intraday (asofdate) MINMAX ANALYZE sys. history (asofdate) MINMAX ANALYZE sys. currentyear (asofdate) MINMAX still same issue the issue exists for a few dates that I checked, there are many days that do work on the merge table , all dates work on the view and the individual tables. I thought it might be an issue with statistics then the conversion function made it work on the merge table , so now at a loss. the following query on the merge table return no rows --------------------------------------------------------------------------------------------- select fundid,sum(curdlttot) as fxt from vw where asofdate='2017-10-02' group by fundid The following does return data from the merge table albeit, much slower - after converting date value --------------------------------------------------------------------------------------------- select fundid,sum(curdlttot) as fxt from vw where asofdate='2017-10-02D' group by fundid select fundid,sum(curdlttot) as fxt from vw where asofdate= date_to_str(asofdate, '%Y-%m-%d') = '2017-10-02' group by fundid the followings query on the subtable of the merge table returns data with no issues or performance --------------------------------------------------------------------------------------------- select fundid,sum(curdlttot) as fxt from currentyear where asofdate='2017-10-02' group by fundid creating a view on the union of all three tables returns data as expected create view test_all as select * from intraday union all select * from history union all select * from currentyear select fundid,sum(curdlttot) as fxt from test_all where asofdate='2017-10-02' group by fundid Warren S. Master Chief Technology Officer, CISO TRG Management LP 280 Park Avenue - 30th floor/West - New York, NY 10017 Phone 212.984.3504 Email warren.master@rohatyngroup.commailto:warren.master@rohatyngroup.com Web www.rohatyngroup.comhttp://www.rohatyngroup.com/ Linkedin www.linkedin.com/in/warrenmasterhttp://www.linkedin.com/in/warrenmaster This e-mail communication and any attachments may contain confidential and privileged information and are for use by the intended addressee(s) only. If you are not the intended addressee, you have received this communication in error. Any dissemination or reproduction of this email or its contents is strictly prohibited and may be unlawful. If you suspect you have received this communication in error, please notify us immediately by replying to this message and delete it from your computer.Thank you.