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with tab(row_id,base_id,auth_id) as ( select 4,1,1 union all select 5,1,3 union all select 6,2,2 union all select 7,2,6 union all select 8,2,5 ) select row_number() over (order by base_id) as row_id, base_id, string_agg(auth_id::varchar,'-' order by auth_id) from tab group by base_id;
row_id
base_id
string_agg
1
1
1-3
2
2
2-5-6