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PyGIS & multi criteria selection

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Hello everyone,


I am a beginner using QGIS and especially using Python for QGIS.

I want to build a QGIS Python program to request a database and to find (and to select) the records that meet certain conditions.


How can I do, for each value of an attribute field, to select the more relevant line (in other attribute field Date & Time) with the nearest date and time of the one defined by the user and to export the information into a new shapefile?


Thank you for your help.

Have a good day.


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