How about the following as a virtual layer

Select max(depth to) from YOURLAYER - deepest 'depth to' for all drill holes

Or 

Select drill hole id, max(depth to ) from YOURLAYER group by drill hole id - 
deepest depth per hole id?


-----Original Message-----
From: Qgis-user <[email protected]> On Behalf Of Grant Boxer
Sent: Friday, 26 June 2020 12:20 PM
To: [email protected]
Subject: [Qgis-user] Selecting maximum values in drill holes

I am trying to find out the best way to select the highest values in a set of 
drill holes as well as the bottom of hole values. The files contain drill hole 
id, depth from, depth to and assay values. If have tried the maximum function 
but I don't think I have the syntax correct. 
Anyone have any suggestions?

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