Questions tagged [relation]
The relation tag has no usage guidance.
48
questions
5
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1
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442
views
Automatically fill in attributes of parent feature in QGIS
I have a data table that holds different information about buildings in a GeoPackage. Different elements of the buildings can be entered, e.g. sometimes I only have the building as a whole, sometimes ...
- 1,616
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0
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108
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Merging queries to return ways/nodes that are within relations matching criteria using Overpass API
Motivation - I am currently processing a number of relations matching criteria and then doing an additional query to get all the ways/nodes within those relations. .
Goal - I'm trying to simplify this ...
- 131
1
vote
1
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29
views
Show selection of point in relation of a vector field?
I have two files,
vector "streets"
a series of point "civic numers" or "address"
I want to select a random street and have the field selection of the relative civic ...
4
votes
2
answers
422
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QGIS Setup n:m relation to enable cross-layer search
In QGIS I want to set up a n:m relation between two tables "parcels" (polygons) and "owners" (no geometry). Both share a field index1 (containing of numbers and letters) by which ...
- 3,022
1
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1
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836
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Expression-based table relation in QGIS, avoiding joins and relates
In QGIS 3.18. I have two tables, one as a part of a .shp and the other a tab-delimited .txt with no geometry:
my .shp attribute table contains a list of sites, and
my .txt table contains a list of ...
- 1,101
0
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0
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62
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Opening one corresponding related table in attribute form for selected feature in multipolygon in QGIS
I have MultiPolygon A with 9 features, each feature should be described by one non-spatial attribute table with 10 - 500 features. I tried to create 9 relations like A-to-Table1, A-to_Table2 ...A-to-...
1
vote
1
answer
392
views
N:M relation in QGIS with custom form in Qt Designer
The manual: https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/attribute_table.html#creating-one-or-many-to-many-relations describes how to create a N:M relation and how to use it with ...
- 71
3
votes
1
answer
113
views
Counting the number of relations
In QGIS I created a one-to-many relation between a polygon layer and a non-geometry table, so it has multiple lines for each feature in the polygon layer. My question now is how can I count how many ...
- 1,092
2
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0
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194
views
How to list relationed objects on QGIS expression for HTML tips
I have two layers with an 1-N relationship
The parent layer, "RADAR" is a point layer, while the child layer, "FAIXA_RADAR" is a tabular without geometry layer.
To make feature ...
- 95
1
vote
1
answer
251
views
QGIS best way for capturing features without geometry and child features
I have two (PostGIS) layers in my QGIS (3.18) project and I defined a relation between them.
The first layer PARENT has no geometry.
The second layer CHILD is the child layer and has a geometry.
In ...
- 173
12
votes
3
answers
750
views
Handling multiple selections result in "Value Relation Widget" in QGIS
Using the "Allow multiple selections" in the "Value Relation Widget" results in {value1,value2,...}. But arrays in QGIS are written like ['value1','value2',...].
How do I handle ...
- 8,338
0
votes
1
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309
views
Where are QuickOSM relations?
When I use quickOSM in QGIS to download OSM data, I check the "relations" option, but then?
My need is the following :
Download OSM data for a specific area
In the table for the "point&...
- 21
2
votes
0
answers
75
views
QGIS Hidden attributes not hidden in Relations
I have a PostGIS view, which a referencing layer for another layer for many to one relation in QGIS. I have hidden the following fields id, table_name, oid of the postgis view so that the user would ...
- 1,574
1
vote
2
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203
views
QGIS Atlas attributes
So I have two layers. First one is line layer (columns: id, length, address_id) and atlas is connected to it so when I change objects, map is zooming to next line. Secound is point layer (columns: ...
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273
views
QGIS N:M relations - possibility to edit multiple features?
I have a working QGIS project with multiple relations and all is well until I try the Toggle multi edit mode for N:M relations. I'm working with QGIS 3.10+ (3.14.16) and Windows and PostGIS.
Is it ...
- 194