Hello Oisin,
Thank you for your guidance regarding this topic, and I am sorry if I need
further assistance, but I'm kind of new to QGIS.
Regarding the need to define the layer for each attribute, will it work if I
stated like I had wroten before? i.e.:'Table1.H3centr_h9_cobcubierto' = 1 OR
'Table2.H3centr_h9_cobcubierto' = 1 Will QGIS recognize it?
And to find the comparable record, certaingly I can use a common id. So I will
explore the getfeature( ) tool that you suggest, thank you very much.
Regards.
Guillermo Parra Montealegre e-mail: meminp...@yahoo.com
El martes, 14 de mayo de 2024, 13:23:07 GMT-6, oisin.kelly.w...@gmail.com
<oisin.kelly.w...@gmail.com> escribió:
You definitely need to define the layer for each attribute (except the current
layer).
You also need a way to find the comparable record, e.g.
(i) with a common id (use getfeature() to access attribute) or
(ii) spatially use one of the overlay functions.
Oisin
Get BlueMail for Android On 14 May 2024, at 19:52, Guillermo Parra via
QGIS-User <qgis-user@lists.osgeo.org> wrote:
Hi,
I have several tables with the same fields, same grid information, but
different field data for each one (information from different providers, let's
say).
Particularly, I have a field with 0 and 1 which represent if each provider
have, or not have coverage in that area.
I want to compare the values of each table to set "1" if at least one of the
providers have coverage in each area, or "0" if None of them have it, so I used
the field calculator and the expression builder with this sql statement:
if( 'H3centr_h9_cobcubierto' = 1 OR 'H3centr_h9_cobcubierto' = 1
OR'H3centroides_h9_cobGT3D cubierto' = 1 OR'H3centroides_h9_cob_cubierto' =
'1' OR'H3centr_h9_cob_cubierto' = '1' OR'H3cent_cob_cubierto' = '1'
OR"H3centrR9_Tc3D_cubierto" ='1', 1, 0)
The problem is that apparently it is considering only the last field in double
quotes (which is in the same table that the new column where I want to fill the
data), and the other fields apparently are beign ignored.
I would guest that it would be better to specify the table and field where each
data will be taken ( like if( 'Table1.H3centr_h9_cobcubierto' = 1 OR
'Table2.H3centr_h9_cobcubierto' = 1 OR... etc.)but when I make double click
over each layer field, QGIS writes it that way, so I asume it is correct.
So, if someone have an idea on how I can make it work, I would greatly
appreciate any suggestion.Thanks,
Guillermo.
Guillermo Parra Montealegre e-mail: meminp...@yahoo.com
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