DSB Q030

WITH customer_total_return AS (
  SELECT
    wr_returning_customer_sk AS ctr_customer_sk,
    ca_state AS ctr_state,
    wr_reason_sk AS ctr_reason_sk,
    SUM(wr_return_amt) AS ctr_total_return
  FROM web_returns, date_dim, customer_address, item
  WHERE
    wr_returned_date_sk = d_date_sk
    AND d_year = 2000
    AND wr_returning_addr_sk = ca_address_sk
    AND wr_item_sk = i_item_sk
    AND i_manager_id BETWEEN 91 AND 100
    AND wr_return_amt / wr_return_quantity BETWEEN 271 AND 300
  GROUP BY
    wr_returning_customer_sk,
    ca_state,
    wr_reason_sk
)
SELECT
TOP 100
  c_customer_id,
  c_salutation,
  c_first_name,
  c_last_name,
  c_preferred_cust_flag,
  c_birth_day,
  c_birth_month,
  c_birth_year,
  c_birth_country,
  c_login,
  c_email_address,
  c_last_review_date,
  ctr_total_return
FROM customer_total_return AS ctr1, customer_address, customer
WHERE
  ctr1.ctr_total_return > (
    SELECT
      AVG(ctr_total_return) * 1.2
    FROM customer_total_return AS ctr2
    WHERE
      ctr1.ctr_state = ctr2.ctr_state
  )
  AND ca_address_sk = c_current_addr_sk
  AND ca_state IN ('AR', 'GA', 'IL', 'TX')
  AND ctr1.ctr_customer_sk = c_customer_sk
  AND ctr1.ctr_reason_sk IN (15, 50)
  AND c_birth_year BETWEEN 1987 AND 1993
ORDER BY
  c_customer_id,
  c_salutation,
  c_first_name,
  c_last_name,
  c_preferred_cust_flag,
  c_birth_day,
  c_birth_month,
  c_birth_year,
  c_birth_country,
  c_login,
  c_email_address,
  c_last_review_date,
  ctr_total_return;