[Qgis-user] 1 to many relationship does not allow to display the many

[DelazJ]

Hi Janneke,

Maybe you need a field that would uniquely identify the 170 asset rows
(their primary key). You can use an ID field of your asset layer or
construct one with row_number function?


Regards,
Harrissou

Le jeu. 19 sept. 2019 à 16:10, Janneke van Dijk <janneke.qgis at gmail.com> a
écrit :

> Dear list,
>
> I have a parent - child relationship set up between a table location (1,
> the parent) and a table assets (many, the child). The location table
> contains geometry, the asset table does not. I would like to be able to
> display each record in the asset table with the corresponding geometry
> of the location table - so if there are 3 assets at a certain location,
> I would like to display 3 points (each with identical geometry).
>
> What I can do with the DB manager is:
>
> select location_point.geom, asset_point.assetid, location_point.fid
> from asset_point cross join location_point on asset_point.locationid =
> location_point.fid
>
> this query yields 170 records, corresponding with the number of records
> in the assets table. When I load as a new layer, the result is a table
> with 170 records, but 100 filtered (the total number of locations). I
> chose assetid to be the unique id (which it is).
>
> Is that expected behaviour? How else can I display all the records in
> the assets table (instead of only the 100 that are filtered now)? I know
> I can do it in Postgres but for my purpose now I don't want to go there.
>
> Any insights deeply appreciated!
>
> Janneke
>
>
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