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drop table if exists employees cascade; create table employees(id int, name text, desk_number int); insert into employees values (1 ,'Bill', 314), (2 ,'Joe', 200), (3 ,'Bob', 314), (4 ,'Matt', 189), (5 ,'Sam', 314), (6 ,'Anne', 150); select string_agg(e1.id::text, ',') as id_list from employees e1 where exists (select * from employees e2 where e1.desk_number = e2.desk_number and e1.id <> e2.id);
absolute service time: 0,41 sec
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