0001 WITH all_sales AS (
0002 SELECT
0003 d_year,
0004 i_brand_id,
0005 i_class_id,
0006 i_category_id,
0007 i_manufact_id,
0008 SUM(sales_cnt) AS sales_cnt,
0009 SUM(sales_amt) AS sales_amt
0010 FROM (
0011 SELECT
0012 d_year,
0013 i_brand_id,
0014 i_class_id,
0015 i_category_id,
0016 i_manufact_id,
0017 cs_quantity - COALESCE(cr_return_quantity, 0) AS sales_cnt,
0018 cs_ext_sales_price - COALESCE(cr_return_amount, 0.0) AS sales_amt
0019 FROM catalog_sales
0020 JOIN item ON i_item_sk = cs_item_sk
0021 JOIN date_dim ON d_date_sk = cs_sold_date_sk
0022 LEFT JOIN catalog_returns ON (cs_order_number = cr_order_number
0023 AND cs_item_sk = cr_item_sk)
0024 WHERE i_category = 'Books'
0025 UNION
0026 SELECT
0027 d_year,
0028 i_brand_id,
0029 i_class_id,
0030 i_category_id,
0031 i_manufact_id,
0032 ss_quantity - COALESCE(sr_return_quantity, 0) AS sales_cnt,
0033 ss_ext_sales_price - COALESCE(sr_return_amt, 0.0) AS sales_amt
0034 FROM store_sales
0035 JOIN item ON i_item_sk = ss_item_sk
0036 JOIN date_dim ON d_date_sk = ss_sold_date_sk
0037 LEFT JOIN store_returns ON (ss_ticket_number = sr_ticket_number
0038 AND ss_item_sk = sr_item_sk)
0039 WHERE i_category = 'Books'
0040 UNION
0041 SELECT
0042 d_year,
0043 i_brand_id,
0044 i_class_id,
0045 i_category_id,
0046 i_manufact_id,
0047 ws_quantity - COALESCE(wr_return_quantity, 0) AS sales_cnt,
0048 ws_ext_sales_price - COALESCE(wr_return_amt, 0.0) AS sales_amt
0049 FROM web_sales
0050 JOIN item ON i_item_sk = ws_item_sk
0051 JOIN date_dim ON d_date_sk = ws_sold_date_sk
0052 LEFT JOIN web_returns ON (ws_order_number = wr_order_number
0053 AND ws_item_sk = wr_item_sk)
0054 WHERE i_category = 'Books') sales_detail
0055 GROUP BY d_year, i_brand_id, i_class_id, i_category_id, i_manufact_id)
0056 SELECT
0057 prev_yr.d_year AS prev_year,
0058 curr_yr.d_year AS year,
0059 curr_yr.i_brand_id,
0060 curr_yr.i_class_id,
0061 curr_yr.i_category_id,
0062 curr_yr.i_manufact_id,
0063 prev_yr.sales_cnt AS prev_yr_cnt,
0064 curr_yr.sales_cnt AS curr_yr_cnt,
0065 curr_yr.sales_cnt - prev_yr.sales_cnt AS sales_cnt_diff,
0066 curr_yr.sales_amt - prev_yr.sales_amt AS sales_amt_diff
0067 FROM all_sales curr_yr, all_sales prev_yr
0068 WHERE curr_yr.i_brand_id = prev_yr.i_brand_id
0069 AND curr_yr.i_class_id = prev_yr.i_class_id
0070 AND curr_yr.i_category_id = prev_yr.i_category_id
0071 AND curr_yr.i_manufact_id = prev_yr.i_manufact_id
0072 AND curr_yr.d_year = 2002
0073 AND prev_yr.d_year = 2002 - 1
0074 AND CAST(curr_yr.sales_cnt AS DECIMAL(17, 2)) / CAST(prev_yr.sales_cnt AS DECIMAL(17, 2)) < 0.9
0075 ORDER BY
0076 sales_cnt_diff,
0077 sales_amt_diff
0078 LIMIT 100
