SELECT
  cc_call_center_id Call_Center,
  cc_name Call_Center_Name,
  cc_manager Manager,
  sum(cr_net_loss) Returns_Loss
FROM
  call_center, catalog_returns, date_dim, customer, customer_address,
  customer_demographics, household_demographics
WHERE
  cr_call_center_sk = cc_call_center_sk
    AND cr_returned_date_sk = d_date_sk
    AND cr_returning_customer_sk = c_customer_sk
    AND cd_demo_sk = c_current_cdemo_sk
    AND hd_demo_sk = c_current_hdemo_sk
    AND ca_address_sk = c_current_addr_sk
    AND d_year = 1998
    AND d_moy = 11
    AND ((cd_marital_status = 'M' AND cd_education_status = 'Unknown')
    OR (cd_marital_status = 'W' AND cd_education_status = 'Advanced Degree'))
    AND hd_buy_potential LIKE 'Unknown%'
    AND ca_gmt_offset = -7
GROUP BY cc_call_center_id, cc_name, cc_manager, cd_marital_status, cd_education_status
ORDER BY sum(cr_net_loss) DESC