Concatenate strings for distinct values

[#1]

Good morning, I have the following situation:

I have a code in column A and a column B with a field tha contains NOTES.
The field A may be repeated on multiple lines with different values of NOTES.

I need to have for each distinct value of the field A concatenation NOTES present in field B.

How can I do this?

Thanks

[anbu1984]

aggr (Concat (DISTINCT NONOTA, '',RIGA), NOKEY)

[#3]

Thanks Anbu, it works great !