On 6 Dec 2017, at 9:36am, Jean-Luc Hainaut <jean-luc.hain...@unamur.be> wrote:

> Actually, the left outer join is sufficient to execute all the outer join 
> operators:
> 
> - right outer join: just swap the "from" arguments
> 
> - full outer joins: union of left and right outer joins

I never realised that.  It’s clever.  And it’s also a cheap way to implement 
FULL JOINs.

Not optimized, but it simple, and changes "can’t do" to "can do".  Thanks.

Simon.
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