On 23.09.20 10:21, Bernd Vogelgesang wrote:
On 23.09.20 09:04, jan.ru...@stadt-koeln.de wrote:
hi there,
I got a table with a content for streetnames. For example the street
"Mainstreet" ist separated in
10 different rows of data (one dataset for each letter in the word
"Mainstreet").
I would like to merge these 10 datasets to one dataset. All those
datasets have one ID - so they qgis should
be able to search for the same Id and create a new textstring with
all the leters.
I don't know how to practicly implement my idea in QGIS. Does anyone
have an idea for me?
Thanks a lot and I wish you all a good day!
Jan R.
I think you could try to use an aggregate expression in the field
calculator for a new field.
sth like:
aggregate(
layer:= 'streets',
aggregate:='concatenate',
expression:=name,
concatenator:='', <- 2 single quotes, not 1 double, for an empty
concatenator!
filter:= ID
)
I don't know if the filter for ID works in this way. Can't check that
cause I do not own such "interesting" data ;)
Cheers,
Bernd
found no way to make my initial aproach work, but this:
array_to_string(array_agg("street",group_by:="ID"),'','')
in the field calculator for a new text field glues together the complete
street name
If someone knows a resource with more examples how to work with all
these great functions available, please post it.
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