https://bugzilla.wikimedia.org/show_bug.cgi?id=57724

--- Comment #5 from José Antonio <[email protected]> ---
(In reply to comment #3)
> Thanks for the link to 47055 and pointing to 37702.
> 
> It seems that all the problems related to postgresql are rooted on  
> creating 
> data sets that are not compatible with the operations that smw wants to
> excute
> on them.
> 
> Indeed in this case mysql seems to enable outer joins on nullables.
> 
> Here It seems that the most  more straight approach would be set “not null” 
> for fields that are used in outer joins.
> 
> Regards.
> 
> J.A.


Setting a non null  constraint for all the fields of the tables  involved in
the outer joint does not solve the problem.

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