[英]how to run two different queries in a single query using MySQL?
我有一个包含这些列的发票表。,
id total date country
1 50 2016-01-25 USA
2 40 2016-01-24 UK
3 30 2016-01-22 France
4 40 2016-01-26 UK
5 50 2016-01-18 USA
6 60 2016-02-20 USA
7 70 2016-02-21 USA
8 55 2016-02-18 UK
9 75 2016-02-19 France
而且我想按月获得美国总金额,非美国总金额组,我使用这些查询我只获得美国总金额
SELECT MONTH(date),YEAR(date),SUM(total) as usa_amount
FROM Invoice
WHERE YEAR(date) = '2016'
AND country='USA'
GROUP BY MONTH(date)
我得到了这个结果
MONTH(date) YEAR(date) usa_amount
01 2016 100
02 2016 130
我希望使用mysql工会或其他什么结果?
MONTH(date) YEAR(date) usa_amount non_usa_amount
01 2016 100 110
02 2016 130 130
在sum()
使用一个case
SELECT MONTH(date),
SUM(case when country = 'USA' then total else 0 end) as usa_amount,
SUM(case when country <> 'USA' then total else 0 end) as non_usa_amount
FROM Invoice
WHERE YEAR(date) = 2016
GROUP BY MONTH(date)
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