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CREATE TABLE table_name (`id` int, `type` varchar(6)) ; INSERT INTO table_name (`id`, `type`) VALUES (1, 'type_1'), (2, 'type_2'), (3, 'type_1'), (4, 'type_1'), (5, 'type_3'), (6, 'type_4'), (7, 'type_2'), (8, 'type_4'), (9, 'type_4') ;
select type, group_concat(id) from table_name group by type
type
group_concat(id)
type_1
1,3,4
type_2
2,7
type_3
5
type_4
6,8,9