SELECT cast(amc AS DECIMAL(15, 4)) / cast(pmc AS DECIMAL(15, 4)) am_pm_ratio
FROM (SELECT count(*) amc
FROM web_sales, household_demographics, time_dim, web_page
WHERE ws_sold_time_sk = time_dim.t_time_sk
  AND ws_ship_hdemo_sk = household_demographics.hd_demo_sk
  AND ws_web_page_sk = web_page.wp_web_page_sk
  AND time_dim.t_hour BETWEEN 8 AND 8 + 1
  AND household_demographics.hd_dep_count = 6
  AND web_page.wp_char_count BETWEEN 5000 AND 5200) at,
  (SELECT count(*) pmc
  FROM web_sales, household_demographics, time_dim, web_page
  WHERE ws_sold_time_sk = time_dim.t_time_sk
    AND ws_ship_hdemo_sk = household_demographics.hd_demo_sk
    AND ws_web_page_sk = web_page.wp_web_page_sk
    AND time_dim.t_hour BETWEEN 19 AND 19 + 1
    AND household_demographics.hd_dep_count = 6
    AND web_page.wp_char_count BETWEEN 5000 AND 5200) pt
ORDER BY am_pm_ratio
LIMIT 100