--q74.sql--

 with year_total as (
 select
    c_customer_id customer_id, c_first_name customer_first_name,
    c_last_name customer_last_name, d_year as year,
    sum(ss_net_paid) year_total, 's' sale_type
 from
    customer, store_sales, date_dim
 where c_customer_sk = ss_customer_sk
    and ss_sold_date_sk = d_date_sk
    and d_year in (2001,2001+1)
 group by
    c_customer_id, c_first_name, c_last_name, d_year
 union all
 select
    c_customer_id customer_id, c_first_name customer_first_name,
    c_last_name customer_last_name, d_year as year,
    sum(ws_net_paid) year_total, 'w' sale_type
 from
    customer, web_sales, date_dim
 where c_customer_sk = ws_bill_customer_sk
    and ws_sold_date_sk = d_date_sk
    and d_year in (2001,2001+1)
 group by
    c_customer_id, c_first_name, c_last_name, d_year)
 select
    t_s_secyear.customer_id, t_s_secyear.customer_first_name, t_s_secyear.customer_last_name
 from
    year_total t_s_firstyear, year_total t_s_secyear,
    year_total t_w_firstyear, year_total t_w_secyear
 where t_s_secyear.customer_id = t_s_firstyear.customer_id
    and t_s_firstyear.customer_id = t_w_secyear.customer_id
    and t_s_firstyear.customer_id = t_w_firstyear.customer_id
    and t_s_firstyear.sale_type = 's'
    and t_w_firstyear.sale_type = 'w'
    and t_s_secyear.sale_type = 's'
    and t_w_secyear.sale_type = 'w'
    and t_s_firstyear.year = 2001
    and t_s_secyear.year = 2001+1
    and t_w_firstyear.year = 2001
    and t_w_secyear.year = 2001+1
    and t_s_firstyear.year_total > 0
    and t_w_firstyear.year_total > 0
    and case when t_w_firstyear.year_total > 0 then t_w_secyear.year_total / t_w_firstyear.year_total else null end
      > case when t_s_firstyear.year_total > 0 then t_s_secyear.year_total / t_s_firstyear.year_total else null end
 order by 1, 1, 1
 limit 100