WITH ws AS
(SELECT
    d_year AS ws_sold_year,
    ws_item_sk,
    ws_bill_customer_sk ws_customer_sk,
    sum(ws_quantity) ws_qty,
    sum(ws_wholesale_cost) ws_wc,
    sum(ws_sales_price) ws_sp
  FROM web_sales
    LEFT JOIN web_returns ON wr_order_number = ws_order_number AND ws_item_sk = wr_item_sk
    JOIN date_dim ON ws_sold_date_sk = d_date_sk
  WHERE wr_order_number IS NULL
  GROUP BY d_year, ws_item_sk, ws_bill_customer_sk
),
    cs AS
  (SELECT
    d_year AS cs_sold_year,
    cs_item_sk,
    cs_bill_customer_sk cs_customer_sk,
    sum(cs_quantity) cs_qty,
    sum(cs_wholesale_cost) cs_wc,
    sum(cs_sales_price) cs_sp
  FROM catalog_sales
    LEFT JOIN catalog_returns ON cr_order_number = cs_order_number AND cs_item_sk = cr_item_sk
    JOIN date_dim ON cs_sold_date_sk = d_date_sk
  WHERE cr_order_number IS NULL
  GROUP BY d_year, cs_item_sk, cs_bill_customer_sk
  ),
    ss AS
  (SELECT
    d_year AS ss_sold_year,
    ss_item_sk,
    ss_customer_sk,
    sum(ss_quantity) ss_qty,
    sum(ss_wholesale_cost) ss_wc,
    sum(ss_sales_price) ss_sp
  FROM store_sales
    LEFT JOIN store_returns ON sr_ticket_number = ss_ticket_number AND ss_item_sk = sr_item_sk
    JOIN date_dim ON ss_sold_date_sk = d_date_sk
  WHERE sr_ticket_number IS NULL
  GROUP BY d_year, ss_item_sk, ss_customer_sk
  )
SELECT
  round(ss_qty / (coalesce(ws_qty + cs_qty, 1)), 2) ratio,
  ss_qty store_qty,
  ss_wc store_wholesale_cost,
  ss_sp store_sales_price,
  coalesce(ws_qty, 0) + coalesce(cs_qty, 0) other_chan_qty,
  coalesce(ws_wc, 0) + coalesce(cs_wc, 0) other_chan_wholesale_cost,
  coalesce(ws_sp, 0) + coalesce(cs_sp, 0) other_chan_sales_price
FROM ss
  LEFT JOIN ws
    ON (ws_sold_year = ss_sold_year AND ws_item_sk = ss_item_sk AND ws_customer_sk = ss_customer_sk)
  LEFT JOIN cs
    ON (cs_sold_year = ss_sold_year AND cs_item_sk = ss_item_sk AND cs_customer_sk = ss_customer_sk)
WHERE coalesce(ws_qty, 0) > 0 AND coalesce(cs_qty, 0) > 0 AND ss_sold_year = 2000
ORDER BY
  ratio,
  ss_qty DESC, ss_wc DESC, ss_sp DESC,
  other_chan_qty,
  other_chan_wholesale_cost,
  other_chan_sales_price,
  round(ss_qty / (coalesce(ws_qty + cs_qty, 1)), 2)
LIMIT 100