I had an issue with outer joins a while ago, it's not exactly what you
describe but maybe the answer could help:

http://www.impredicative.com/pipermail/ur/2017-July/002645.html

Cheers

On Thu, Jun 6, 2019, 13:56 Simon Van Casteren <[email protected]>
wrote:

> Hey everybody,
>
> Something that's been bothering me for some time now. Is it possible to
> OUTER JOIN a nullable field to a non-nullable field? I keep getting type
> errors and can't figure out how to tell the compiler he should only do the
> join for the records that the nullable field is non-null... SQL surely
> allows this, but I haven't figured it out in Ur/Web yet.
>
> Any help much appreciated!
>
> Keep up the good work.
>
> Simon
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