SELECT
  CASE WHEN (SELECT count(*)
  FROM store_sales
  WHERE ss_quantity BETWEEN 1 AND 20) > 62316685
    THEN (SELECT avg(ss_ext_discount_amt)
    FROM store_sales
    WHERE ss_quantity BETWEEN 1 AND 20)
  ELSE (SELECT avg(ss_net_paid)
  FROM store_sales
  WHERE ss_quantity BETWEEN 1 AND 20) END bucket1,
  CASE WHEN (SELECT count(*)
  FROM store_sales
  WHERE ss_quantity BETWEEN 21 AND 40) > 19045798
    THEN (SELECT avg(ss_ext_discount_amt)
    FROM store_sales
    WHERE ss_quantity BETWEEN 21 AND 40)
  ELSE (SELECT avg(ss_net_paid)
  FROM store_sales
  WHERE ss_quantity BETWEEN 21 AND 40) END bucket2,
  CASE WHEN (SELECT count(*)
  FROM store_sales
  WHERE ss_quantity BETWEEN 41 AND 60) > 365541424
    THEN (SELECT avg(ss_ext_discount_amt)
    FROM store_sales
    WHERE ss_quantity BETWEEN 41 AND 60)
  ELSE (SELECT avg(ss_net_paid)
  FROM store_sales
  WHERE ss_quantity BETWEEN 41 AND 60) END bucket3,
  CASE WHEN (SELECT count(*)
  FROM store_sales
  WHERE ss_quantity BETWEEN 61 AND 80) > 216357808
    THEN (SELECT avg(ss_ext_discount_amt)
    FROM store_sales
    WHERE ss_quantity BETWEEN 61 AND 80)
  ELSE (SELECT avg(ss_net_paid)
  FROM store_sales
  WHERE ss_quantity BETWEEN 61 AND 80) END bucket4,
  CASE WHEN (SELECT count(*)
  FROM store_sales
  WHERE ss_quantity BETWEEN 81 AND 100) > 184483884
    THEN (SELECT avg(ss_ext_discount_amt)
    FROM store_sales
    WHERE ss_quantity BETWEEN 81 AND 100)
  ELSE (SELECT avg(ss_net_paid)
  FROM store_sales
  WHERE ss_quantity BETWEEN 81 AND 100) END bucket5
FROM reason
WHERE r_reason_sk = 1