--
-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.  See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License.  You may obtain a copy of the License at
--
--    http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- q11 --
with year_total as (
  select
    c_customer_id customer_id,
    c_first_name customer_first_name,
    c_last_name customer_last_name,
    c_preferred_cust_flag customer_preferred_cust_flag,
    c_birth_country customer_birth_country,
    c_login customer_login,
    c_email_address customer_email_address,
    d_year dyear,
    sum(ss_ext_list_price - ss_ext_discount_amt) 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
  group by
    c_customer_id,
    c_first_name,
    c_last_name,
    c_preferred_cust_flag,
    c_birth_country,
    c_login,
    c_email_address,
    d_year
  union
  all
  select
    c_customer_id customer_id,
    c_first_name customer_first_name,
    c_last_name customer_last_name,
    c_preferred_cust_flag customer_preferred_cust_flag,
    c_birth_country customer_birth_country,
    c_login customer_login,
    c_email_address customer_email_address,
    d_year dyear,
    sum(ws_ext_list_price - ws_ext_discount_amt) 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
  group by
    c_customer_id,
    c_first_name,
    c_last_name,
    c_preferred_cust_flag,
    c_birth_country,
    c_login,
    c_email_address,
    d_year
)
select
  t_s_secyear.customer_id,
  t_s_secyear.customer_first_name,
  t_s_secyear.customer_last_name,
  t_s_secyear.customer_email_address
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.dyear = 2001
  and t_s_secyear.dyear = 2001 + 1
  and t_w_firstyear.dyear = 2001
  and t_w_secyear.dyear = 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 0.0
  end > case
    when t_s_firstyear.year_total > 0 then t_s_secyear.year_total / t_s_firstyear.year_total
    else 0.0
  end
order by
  t_s_secyear.customer_id,
  t_s_secyear.customer_first_name,
  t_s_secyear.customer_last_name,
  t_s_secyear.customer_email_address
limit
  100;
