我想在MySQL中进行查询以获取一年中每个月的值的总和。
目前我有这样的事情:
SELECT
e.rfc as RFC,
SUM(f.total) AS Total,
MONTH(f.fecha) as Mes
FROM
foo f
INNER JOIN
bar e
ON f.bar_id = e.id
INNER JOIN
baz u
ON e.baz_id = u.id
WHERE
u.id = 3
AND DATE(f.fecha) BETWEEN '2014-01-01' AND '2014-12-31'
GROUP BY
MONTH(f.fecha)
但是在不存在的月份里,foo值没有显示出来。
我的结果就像是:
RFC Total Mes
AAA010101AAA 10556.000000 12
AAA010101BBB 1856.000000 11
AAA010101BBB 66262.896800 10
AAA010101BBB 990.090000 9
AAA010101BBB 73.000000 8
AAA010101BBB 1304761.620000 7
我想要的结果是:
RFC Total Mes
AAA010101AAA 10556.000000 12
AAA010101AAA 0.0 11
... (When no data it's available just return 0.0 for the month)
AAA010101AAA 0.0 1
AAA010101BBB 0.0 12
AAA010101BBB 1856.000000 11
AAA010101BBB 66262.896800 10
AAA010101BBB 990.090000 9
AAA010101BBB 73.000000 8
AAA010101BBB 1304761.620000 7
AAA010101BBB 0.0 6
...
AAA010101BBB 0.0 1
我想填写图表,当没有可用于汇总的foo值时我需要零。
谢谢。
答案 0 :(得分:1)
假设每个rfc
每个月都有某些用户的数据,解决此问题的一种简单方法是使用条件聚合:
SELECT e.rfc as RFC,
SUM(CASE WHEN u.id = 3 THEN f.total ELSE 0 END) AS Total,
MONTH(f.fecha) as Mes
FROM foo f INNER JOIN
bar e
ON f.bar_id = e.id INNER JOIN
baz u
ON e.baz_id = u.id
WHERE DATE(f.fecha) BETWEEN '2014-01-01' AND '2014-12-31'
GROUP BY MONTH(f.fecha) ;
如果这不起作用,您必须开始使用left join
,并为每个rfc
生成每个12个月的行。
编辑:
这是更痛苦的版本:
select sum(total), m.m
from (select distinct month(f.fecha) as m from foo where DATE(f.fecha) BETWEEN '2014-01-01' AND '2014-12-31' ) m left join
foo f
on month(f.fecha) = m.m left join
bar e
ON f.bar_id = e.id left join
baz u
ON e.baz_id = u.id and u.id = 3
group by m.m
order by m.m;
我不知道rfc
值正在做什么。它来自任意行,并不属于查询。