Hello all, The solution with CASE WHEN finally worked Thank you so much! it's amazing seeing so helpful people! Warm regards Nico

Thanks for the clarification. I better understand now, first that my problem is not solvable on ad hoc environment with the only attributes. Also that I should look for some training material. Should I close the topic as unresolved? Thanks again for your time and support. Kind regards

Sorry, I am not sure to understand what you mean by a measure. "Use_date" is just a date recorded in the DB

... got some issues... I tried a first step to retrieve the date of the event': FILTER("Use_date" USING ("Event" = 'Qual')) but I have an error message "[nQSError : 22032] Function FILTER requires at least one measure colun in its first argument. Please have you System Admin...." any idea?

Hi, Thank you Gianni, it seems to be exactly what I was looking for. I will test and come back to you if needed. Thanks again!