优雅地对 AWS Athena 中的多个列求和，不包括空值

Question

我必须通过在 AWS Athena 中添加一些其他列来创建 total_costs、total_proceeds 和 total_net_loss 列。我还必须将 nulls 替换为 zeros，否则结果将为空。我尝试使用 sum() 函数，但它仅适用于单列。下面的查询完成了我想做的事情，但看起来很不优雅。有没有其他更优雅的方法来对 Athena 中的列求和？

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

结合使用SUM和COALESCE，像这样：

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)