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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 = 'Books'
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 = 'Books'
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 = 'Books') 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
LIMIT 100
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