SELECT multiple measurements with GROUP BY

Hello everybody!
could you please help me with the following question?
This works:
SELECT MIN(“myMeasure”),“myTag1”,“myTag2”, WHERE “myTag1” =“myTag1Val” GROUP BY “myTag3”
while if I want to extract an extra measurement it does not, like the following:
SELECT MIN(“myMeasure”),MIN(“myMeasure2”),“myTag1”,“myTag2”, WHERE “myTag1” =“myTag1Val” GROUP BY “myTag3”

Just for info, I’m running these queries from Grafana to create a table.

Many thanks,