Nested Set Analysis in QlikSense - qlikview

Question

My User_ID has several images and with this piece of code I receive the largest IMAGE_NR .
max({$<USER_ID = {'8638087'}> } IMAGE_NR)
Every image number is linked to an IMAGE_ID. How do I get this?
In words:
Give me IMAGE_ID where IMAGE_NR = largest IMAGE_NR of my USER_ID
I tried following that doesn't work:
sum({$<max({<USER_ID={'8638087'}> } IMAGE_NR)>} IMAGE_ID)
Thank you for any thoughts!

Answer 1

Here is a step-by-step solution.
You mention that this already brings back the correct IMAGE_NR:
max({$<USER_ID = {'8638087'}> } IMAGE_NR)
Now you want the IMAGE_ID. The logic is:
=only({CORRECT_IMAGE_NR_SET_ANALYSIS} IMAGE_ID)
I generally prefer to avoid search mode (double quotes inside element list) and instead use a higher evaluation level on the top calculation, so I would recommend:
$(=
'only({<IMAGE_NR={'
& max({$<USER_ID = {'8638087'}> } IMAGE_NR)
& '}>} IMAGE_ID)'
)
This would also provide you a nice preview formula in the formula editor, something like:
only({<IMAGE_NR={210391287}>} IMAGE_ID)

Answer 2

I didn't test it, but i believe it's something like :
only({<IMAGE_NR={'$(=max(IMAGE_NR))'}, USER_ID={'8638087'}>} IMAGE_ID)

Answer 3

If the dimension of the table is USER_ID then this will return the IMAGE_ID of the maximum IMAGE_NR per USER_ID. Should work / return results for any dimension, but then will have to be read as maximum IMAGE_NR per whatever that dimesion is. The minus on IMAGE_NR is to get the largest/last sorted value
firstsortedvalue(IMAGE_ID,-IMAGE_NR)
If you're using it in a text box with no dimension then you can also add the set analysis
firstsortedvalue({<USER_ID={'8638087'}>} IMAGE_ID,-IMAGE_NR)