On Sep 29, 6:14 pm, "Michael Bayer" <mike...@zzzcomputing.com> wrote:
> Andrew wrote:
>
> > This is very confusing; I have an ORM generated SQL statement that is
> > joining on a specific id. However, when I run it, for some reason,
> > the specific id (that was joined on) is occasionally None! However,
> > when I run the generated SQL copied from the server's debug log in
> > SQLDeveloper, I get all the IDs correctly.
Sure, I expected as much, but since the query is complex, I needed
some time to "anonymize it" :)
The query's ORM is as follows:
query = meta.Session.query(
ss.c.session_sid,
au, s, iyo, iy, i, hds
)\
.filter( ss.c.start_date > func.to_date(start_date, 'YYYY-MM-
DD') )\
.filter( au.c.user_sid == ss.c.user_sid )\
.filter( au.c.handle == handle )\
.filter( s.c.user_sid == ss.c.user_sid )\
.filter( iyo.c.year_sid == s.c.staff_sid)\
.filter( iy.c.year_sid == iyo.c.year_sid)\
.filter( iy.c.is_current == 1 )\
.filter( i.c.sid == iy.c.sid)\
.filter( "ssd.session_sid(+) = ss.session_sid")\
.filter( "hds.session_sid(+) = ss.session_sid")\
.order_by( desc(ss.c.start_date) )\
.distinct()
So when I run this and just do a simple loop through the data,
ss.session_sid is appearing as None about 5% of the time. However,
when I copy and paste the generated SQL from the server logs, it is
able to select all of the session_sid's
And to answer your question, as you can see, yes, there *is* an outer
join on the column that is not being displayed. Is there a problem
with the join? Using the outerjoin() function isn't an option because
this query has been specifically optimized for Oracle--and rewriting
it with the joins adds almost 200% more time to the query.
As always, your help is always greatly appreeciated!
Andrew
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