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encontrar productos que los clientes compraron juntos

Prueba lo siguiente:

SELECT c.original_SKU, c.bought_with, count(*) as times_bought_together
FROM (
  SELECT a.sku as original_SKU, b.sku as bought_with
  FROM items a
  INNER join items b
  ON a.order_id = b.order_id AND a.sku != b.sku) c
GROUP BY c.original_SKU, c.bought_with