Bonjour,

"Horizontal" is not the word but I don't know how to explain... and by
extension how to find in archive of list...

Maybe an example ?

I have this
     +-------+-------+
     | a     | b     |
     +-------+-------+
     |     1 |     1 |
     |     1 |     2 |
     |     1 |     3 |
     |     2 |     1 |
     |     2 |     2 |
     |     3 |     1 |
     +-------+-------+

Their is any why to obtain something like that :
     +-------+--------+
     | a     | b      |
     +-------+--------+
     |     1 | 1,2,3  |
     |     2 | 1,2    |
     |     3 | 1      |
     +-------+--------+

Based on a group by or something...

A +

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