如何在單個 mysql 查詢中獲取當天、當周、當月、當年的銷售額總和？

Question

我已經單獨編寫了以下查詢，但我想在一個查詢中，如何做到這一點，誰能幫忙..？

SELECT IFNULL(SUM(net_amount),0) as current_date FROM orders WHERE is_cancelled = false and business_date = CURRENT_DATE();
SELECT IFNULL(SUM(net_amount),0) as current_week FROM orders WHERE is_cancelled = false and YEARWEEK(business_date) = YEARWEEK(CURRENT_DATE());
SELECT IFNULL(SUM(net_amount),0) as current_month FROM orders WHERE is_cancelled = false and MONTH(business_date) = MONTH(CURRENT_DATE());
SELECT IFNULL(SUM(net_amount),0) as current_year FROM orders WHERE is_cancelled = false and YEAR(business_date) = YEAR(CURRENT_DATE());

Answer 1

您可以使用條件聚合來將所有單獨的 select 語句組合成統一的語句，例如

SELECT SUM(CASE WHEN business_date = CURRENT_DATE() 
                THEN 
                    net_amount 
                ELSE 
                    0 
                 END ) AS current_date,
       SUM(CASE WHEN YEARWEEK(business_date) = YEARWEEK(CURRENT_DATE()) 
                THEN 
                    net_amount 
                ELSE 
                    0 
                 END ) AS current_week,
       SUM(CASE WHEN MONTH(business_date) = MONTH(CURRENT_DATE()) 
                THEN 
                    net_amount 
                ELSE 
                    0 
                 END ) AS current_month,
       SUM(CASE WHEN YEAR(business_date) = YEAR(CURRENT_DATE()) 
                THEN 
                    net_amount 
                ELSE 
                    0 
                 END ) AS current_year       
  FROM orders 
 WHERE is_cancelled = false