Question

我有2个查询

SELECT date_format(payments.paymentdate, '%m'), 
       SUM(payments.amount) 
FROM payments 
WHERE payments.`customerNumber` IN 
(
    SELECT customers.`customerNumber` 
    FROM customers 
    WHERE customers.`country` = 'USA' 
    and customers.`customerNumber` = payments.`customerNumber`
)
GROUP BY date_format(payments.paymentdate, '%m')

和

SELECT date_format( payments.paymentdate, '%m') , 
       SUM( payments.amount )
FROM payments
GROUP BY date_format( payments.paymentdate, '%m')

他们返回结果，所以一切都好。但是，我需要获得包含3列的结果 - date_format(payments.paymentdate, '%m')，SUM(payments.amount) (where country is USA)和SUM(payments.amount)（包含所有国家/地区）。

我尝试了以下查询

SELECT date_format( payments.paymentdate, '%m') , 
       SUM(payments.amount ), 
       (
          SELECT SUM(payments.amount) 
          FROM payments 
          WHERE payments.`customerNumber` IN 
          (
             SELECT customers.`customerNumber` 
             FROM customers WHERE customers.`country` = 'USA' 
             and customers.`customerNumber` = payments.`customerNumber`
          )
       )
FROM payments
GROUP BY date_format( payments.paymentdate, '%m')

但我有美国支付的总和，而不是几个月的总和。

我该如何解决？

谢谢！

Answer 1

您想要所有付款的总和以及某些付款的总和。

这对于“if”声明来说是完美的。我仍然认为你迟早要'％Y-％m'，不要混淆2014年4月到2015年4月。

SELECT date_format(payments.paymentdate, '%m') as month, SUM(payments.amount) as amount_total, sum(if(customers.country='USA', payments.amount, 0)) as amount_USA
FROM payments 
inner join customers on customers.customerNumber = payments.customerNumber
GROUP BY date_format(payments.paymentdate, '%m')

在SQL中的一个表中连接两个查询

1 个答案: