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sql - 优雅地总结 AWS Athena 中的多个列，不包括空值

问题描述

我必须通过在 AWS Athena 中添加一些其他列来创建total_costs、total_proceeds和列。total_net_loss我还必须替换nulls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。以下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式来总结列Athena？

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;

标签： sqlamazon-web-servicesprestoamazon-athena

解决方案

使用SUM和COALESCE组合，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)

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