[Zope] ZBabel translation to Postgres

[Olaf Zanger]

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hi Phil,

> The left join is a notation that says to get all records from the left hand
> side of the join and only those records where the criteria matches from the
> right hand side.
> 
> It is btw a part of most RDBMS engines I've ever used, so it's not that
> unusual a syntax.
> 
> You can also do something similar by using unions.
thanks a lot for that,

do you have any suggestion (principally) how this union would look like

thanks

olaf

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