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CREATE TABLE my_table ( item varchar(15) , item_id int, components varchar(12) ) ; insert into my_table values ('chair',1001,'wood'), ('chair',1001,'screw'), ('chair',1001,'paint'), ('book',1002,'pages'), ('book',1002,'bind');
5 rows affected
SELECT item_id, string_agg(components, ',') as components FROM my_table GROUP BY item_id
item_id
components
1001
wood,screw,paint
1002
pages,bind