I've got the next table of attributes:

enter image description here

I want to perform a dissolve by the first column (date) and get: - Earliest value by group in the second column. - Latest value by group in the third column.

There is any easy way to do so ? The aim is to do so into the modeler so I would try to avoid complex code, or at least an easy way to implement it.


enter image description here

Field "earliest"

minimum("start_t", group_by:="my_date")

Field "latest"

maximum("end_t", group_by:="my_date")
  • I'm glad, thanks. And sorry for this shoddy post, my computer was unstable... Just as a side note, this aggregates function (group_by) may not work for QGIS versions older than 2.16. – Kazuhito Nov 7 '17 at 15:07
  • I didn't try it yet but even if it doesn't work into 2.18 you gave me some ideas to do it ;-) – César Arquero Nov 7 '17 at 15:22

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