--
-- 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.
--
-- q75 --
WITH all_sales AS (
     SELECT
          d_year,
          i_brand_id,
          i_class_id,
          i_category_id,
          i_manufact_id,
          SUM(sales_cnt) AS sales_cnt,
          SUM(sales_amt) AS sales_amt
     FROM
          (
               SELECT
                    d_year,
                    i_brand_id,
                    i_class_id,
                    i_category_id,
                    i_manufact_id,
                    cs_quantity - COALESCE(cr_return_quantity, 0) AS sales_cnt,
                    cs_ext_sales_price - COALESCE(cr_return_amount, 0.0) AS sales_amt
               FROM
                    catalog_sales
                    JOIN item ON i_item_sk = cs_item_sk
                    JOIN date_dim ON d_date_sk = cs_sold_date_sk
                    LEFT JOIN catalog_returns ON (
                         cs_order_number = cr_order_number
                         AND cs_item_sk = cr_item_sk
                    )
               WHERE
                    i_category = 'Sports'
               UNION
               SELECT
                    d_year,
                    i_brand_id,
                    i_class_id,
                    i_category_id,
                    i_manufact_id,
                    ss_quantity - COALESCE(sr_return_quantity, 0) AS sales_cnt,
                    ss_ext_sales_price - COALESCE(sr_return_amt, 0.0) AS sales_amt
               FROM
                    store_sales
                    JOIN item ON i_item_sk = ss_item_sk
                    JOIN date_dim ON d_date_sk = ss_sold_date_sk
                    LEFT JOIN store_returns ON (
                         ss_ticket_number = sr_ticket_number
                         AND ss_item_sk = sr_item_sk
                    )
               WHERE
                    i_category = 'Sports'
               UNION
               SELECT
                    d_year,
                    i_brand_id,
                    i_class_id,
                    i_category_id,
                    i_manufact_id,
                    ws_quantity - COALESCE(wr_return_quantity, 0) AS sales_cnt,
                    ws_ext_sales_price - COALESCE(wr_return_amt, 0.0) AS sales_amt
               FROM
                    web_sales
                    JOIN item ON i_item_sk = ws_item_sk
                    JOIN date_dim ON d_date_sk = ws_sold_date_sk
                    LEFT JOIN web_returns ON (
                         ws_order_number = wr_order_number
                         AND ws_item_sk = wr_item_sk
                    )
               WHERE
                    i_category = 'Sports'
          ) sales_detail
     GROUP BY
          d_year,
          i_brand_id,
          i_class_id,
          i_category_id,
          i_manufact_id
)
SELECT
     prev_yr.d_year AS prev_year,
     curr_yr.d_year AS year,
     curr_yr.i_brand_id,
     curr_yr.i_class_id,
     curr_yr.i_category_id,
     curr_yr.i_manufact_id,
     prev_yr.sales_cnt AS prev_yr_cnt,
     curr_yr.sales_cnt AS curr_yr_cnt,
     curr_yr.sales_cnt - prev_yr.sales_cnt AS sales_cnt_diff,
     curr_yr.sales_amt - prev_yr.sales_amt AS sales_amt_diff
FROM
     all_sales curr_yr,
     all_sales prev_yr
WHERE
     curr_yr.i_brand_id = prev_yr.i_brand_id
     AND curr_yr.i_class_id = prev_yr.i_class_id
     AND curr_yr.i_category_id = prev_yr.i_category_id
     AND curr_yr.i_manufact_id = prev_yr.i_manufact_id
     AND curr_yr.d_year = 2002
     AND prev_yr.d_year = 2002 - 1
     AND CAST(curr_yr.sales_cnt AS DECIMAL(17, 2)) / CAST(prev_yr.sales_cnt AS DECIMAL(17, 2)) < 0.9
ORDER BY
     sales_cnt_diff,
     sales_amt_diff
limit
     100;
