mysql - 如何在 MySQL 查询中汇总每周、每月和每年的金额？

Question

我有一个订单表。我想在单个查询中获得每周、每月和每年的订单价格总和。我怎样才能做到这一点？

如果我单独查询，这很容易。我的查询是:

SELECT SUM(price) AS weekly_price FROM orders WHERE date > DATE_SUB(NOW(), INTERVAL 1 WEEK);        
SELECT SUM(price) AS monthly_price FROM orders WHERE date > DATE_SUB(NOW(), INTERVAL 1 MONTH);
SELECT SUM(price) AS yearly_price FROM orders WHERE date > DATE_SUB(NOW(), INTERVAL 1 YEAR);

请帮我写下您的答案:如何在一次查询中获取我的weekly_price、monthly_price 和 yearly_price？

Answer 1

您可以使用子选择的内部联接

    select t1.weekly_price, t2.monthly_price, t3.yearly_price
    from (  
          SELECT 1 as key, SUM(price) AS weekly_price 
          FROM orders 
          WHERE date > DATE_SUB(NOW(), INTERVAL 1 WEEK) 
    ) t1 
    inner join (      
        SELECT 1 as key, SUM(price) AS monthly_price 
        FROM orders 
        WHERE date > DATE_SUB(NOW(), INTERVAL 1 MONTH)
    ) t2 on t1.key = t2.key
    inner join  ( 
        SELECT 1 as key, SUM(price) AS yearly_price 
        FROM orders 
        WHERE date > DATE_SUB(NOW(), INTERVAL 1 YEAR)
    } t3 on t1.key = t3.key