[Qgis-user] linking n to 1 data

[Nyall Dawson]

On 25 Jan 2016 02:31, "Matthias Kuhn" <matthias at opengis.ch> wrote:
>
> Hi,
>
> There are a number of things to be done to properly support different
usecases:
>
> Join / Aggregate functions support in expressions
>
> Some sort of join possibility should be added to expressions (similar to
the get_feature function) and some aggregate functions. E.g.
>
>     join( "otherlayer"."name", ',' ) RIGHT JOIN otherlayer ON
otherlayer."id" = this."fk"
>
> to create a string like "A,B,C" from three linked entries with name A, B
and C.
>
> Or
>
>     average( "otherlayer"."population" ) RIGHT JOIN otherlayer ON
otherlayer."id" = this."fk"
>
> etc...
>
> Relation support for print composer
>
> Create tables with information from related entries based on the current
atlas feature.

That's already possible, since 2.2? 2.4? Not sure... A long time ago. ;)

Nyall

>
> Other ideas? I'm sure there is a lot more to be done :-)
>
> Matthias
>
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