[英]LEFT Join with SUM not showing result that is not in other table
stations 车站
id | name | region_id
1 | sation1 | 1
2 | sation2 | 1
3 | sation3 | 2
4 | sation4 | 2
expenditure_heads 支出头
id | name
1 | exp1
2 | exp2
3 | exp3
4 | exp4
5 | exp5
expense_details 费用详情
id | expenditure_head_id | station_id | year | month | expense
1 | 1 | 1 | 2015 | 1 | 300
2 | 2 | 1 | 2015 | 1 | 250
3 | 3 | 1 | 2015 | 1 | 100
4 | 4 | 1 | 2015 | 1 | 50
5 | 5 | 1 | 2015 | 1 | 200
6 | 1 | 3 | 2015 | 1 | 75
7 | 2 | 3 | 2015 | 1 | 15
8 | 3 | 3 | 2015 | 1 | 40
9 | 4 | 3 | 2015 | 1 | 300
10 | 5 | 3 | 2015 | 1 | 250
11 | 1 | 3 | 2015 | 2 | 100
12 | 2 | 3 | 2015 | 2 | 50
13 | 3 | 3 | 2015 | 2 | 200
14 | 4 | 3 | 2015 | 2 | 300
15 | 5 | 3 | 2015 | 2 | 250
My desire result is getting a yearly report of all the station with expense of each expenditure_heads i tried 我希望得到的结果是获得所有电台的年度报告,其中包括我尝试过的每笔支出费用
SELECT exp.name AS expenditure,st.name AS station,x.totalexpense
FROM expenditure_heads AS exp
LEFT JOIN
(SELECT expenditure_head_id,station_id,SUM(expense) as totalexpense
FROM expense_details
WHERE year = '2015'
GROUP by expenditure_head_id,station_id
)
AS x ON exp.id = x.expenditure_head_id
LEFT JOIN stations AS st ON x.station_id = st.id WHERE st.region_id=2
this give only a correct result of the station thats id in expense_details 这只会给站的正确结果,即ids_details中的id
expenditure | station | totalexpense
exp1 | sation3 | 175
exp2 | sation3 | 65
exp3 | sation3 | 240
exp4 | sation3 | 600
exp5 | sation3 | 500
but i want result like this 但我想要这样的结果
expenditure | station | totalexpense
exp1 | sation3 | 175
exp2 | sation3 | 65
exp3 | sation3 | 240
exp4 | sation3 | 600
exp5 | sation3 | 500
exp1 | sation4 | 0
exp2 | sation4 | 0
exp3 | sation4 | 0
exp4 | sation4 | 0
exp5 | sation4 | 0
Thank you in advance 先感谢您
Modify your query to use LEFT OUTER JOIN instead of LEFT JOIN 修改查询以使用LEFT OUTER JOIN代替LEFT JOIN
SELECT exp.name AS expenditure,st.name AS station,x.totalexpense
FROM expenditure_heads AS exp
LEFT OUTER JOIN
(SELECT expenditure_head_id,station_id,SUM(expense) as totalexpense
FROM expense_details
WHERE year = '2015'
GROUP by expenditure_head_id,station_id
)
AS x ON exp.id = x.expenditure_head_id
LEFT OUTER JOIN stations AS st ON x.station_id = st.id WHERE st.region_id=2
You can try below query, it might work: 您可以尝试下面的查询,它可能会起作用:
SELECT exp.name AS expenditure,st.name AS station,x.totalexpense, exp_detail.expenditure_head_id, exp_detail.station_id, SUM(exp_detail.expense) AS totalexpense
FROM expenditure_heads exp
LEFT OUTER JOIN
expense_details exp_detail ON exp_detail.year ='2015' AND exp_detail.expenditure_head_id = exp.id
LEFT OUTER JOIN stations st ON exp_detail.station_id = st.id WHERE st.region_id=2
GROUP by exp_detail.expenditure_head_id,exp_detail.station_id
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