優雅地總結 AWS Athena 中的多個列，不包括空值

Question

我必須通過在 AWS Athena 中添加一些其他列來創建total_costs 、 total_proceeds和total_net_loss列。 我還必須用zeros替換nulls ，否則結果將為 null。 我嘗試使用sum()函數，但它僅適用於單列。 以下查詢完成了我想做的事情，但看起來很不雅觀。 有沒有其他更優雅的方法來對Athena列求和？

SELECT loan_identifier,
       monthly_reporting_period,
       current_actual_upb, 
       current_loan_delinquency_status, 
       (COALESCE(foreclosure_costs,0) + COALESCE(property_preservation_and_repair_costs,0) + COALESCE(asset_recovery_costs,0) + COALESCE(miscellaneous_holding_expenses_and_credits,0) + COALESCE(associated_taxes_for_holding_property,0)) AS total_costs,
       (COALESCE(net_sale_proceeds,0) + COALESCE(credit_enhancement_proceeds,0) + COALESCE(repurchase_make_whole_proceeds,0) + COALESCE(other_foreclosure_proceeds,0)) AS total_proceeds,
       current_actual_upb + (current_actual_upb * ((current_interest_rate/100 - 0.0035)/12)*DATE_DIFF('day', last_paid_installement_date, disposition_date)/30) + (COALESCE(foreclosure_costs,0) + COALESCE(property_preservation_and_repair_costs,0) + COALESCE(asset_recovery_costs,0) + COALESCE(miscellaneous_holding_expenses_and_credits,0) + COALESCE(associated_taxes_for_holding_property,0)) - (COALESCE(net_sale_proceeds,0) + COALESCE(credit_enhancement_proceeds,0) + COALESCE(repurchase_make_whole_proceeds,0) + COALESCE(other_foreclosure_proceeds,0)) AS total_net_loss
FROM performance_data;

Answer 1

結合使用SUM和COALESCE ，如下所示：

SELECT SUM(COALESCE(y, 0) + COALESCE(z, 0)) AS aggregate_sum_of_y_and_z
FROM (
  VALUES (1, 2),
         (NULL, 3),
         (2, 1)) AS x (y, z)