add remove split language chart show hidden hide
db<>fiddle
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6 rows affected
id account author doc users
1 1 Иванов 3 {Петя,Вася}
2 1 Иванов 3 {Иван}
3 2 Иванов 3 {Иван}
4 2 Сергеев 3 {Павел}
5 2 Сергеев 3 {Роман}
6 1 Сергеев 3 {Коля,Дима}
output
{"Сергеев" : { "1" : ["Коля","Дима"], "2" : ["Павел","Роман"] }}
{"Иванов" : { "2" : ["Иван"], "1" : ["Петя","Вася","Иван"] }}