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  1. SELECT
  2. orders.id AS id,
  3. string_agg(ordered_items.item_id :: CHARACTER VARYING, ', ') AS items
  4. FROM orders
  5. INNER JOIN ordered_items
  6. ON orders.id = ordered_items.order_id
  7. GROUP BY orders.id;
Success #stdin #stdout 0.02s 23316KB
stdin
Standard input is empty
stdout
SELECT
  orders.id                                                    AS id,
  string_agg(ordered_items.item_id :: CHARACTER VARYING, ', ') AS items
FROM orders
  INNER JOIN ordered_items
    ON orders.id = ordered_items.order_id
GROUP BY orders.id;