List overview how to do it

Hi everybody
Please help, I want to learn something again
My skills are exhausted, I can’t figure it out.
data in db
1, A
1, B
1, C
2, D
2, E

10, X
10, Z
Listview, I can sort it out with the help of a search
But I would like to have such an overview
1, A, B, C
2, D, E

10, X, Z
Any advice welcome

Not really understand what are you talking about. Can you show your blocks for easier understanding?

Two columns of data
1 column number
2 column letters
letters have a confirmed number
1 - A, B, C
2 - D, E
10 - X, Z

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.