基于另一个行值显示金额的总和

我有SQL表基于另一个行值显示金额的总和

id_details 
year-month 
type (only have 2 values , income and outcome) 
amount

和表有一行这样

(year-month)  (type)  (amount) 
November-2012 income  50000 
November-2012 income  30000 
December-2012 income  20000 
November-2012 outcome  10000 
December-2012 outcome  50000 
December-2012 income  10000

我要的是，呈现出这样

结果查询

(year-month) (sum income)  (sum-outcome) (sub-total balance) 
November-2012 80000    10000   70000 
December-2012 30000    50000   -20000

终于

total-balance = 50000

我该怎么做？或者你可以给我推荐更好的表设计

来源

2012-11-26 user1843843

SELECT `year-month`, 
     SUM(CASE WHEN type = 'income' THEN amount ELSE 0 END) `sum-income`, 
     SUM(CASE WHEN type = 'outcome' THEN amount ELSE 0 END) `sum-outcome`, 
     SUM(amount) `sum-total balance` 
FROM <JOINS> 
GROUP BY `year-month`

来源

2012-11-26 15:21:32 Tom

作品般的魅力，谢谢你救了我的命 – user1843843

没问题。该SUM/CASE组合可能非常有用。 – Tom

基于另一个行值显示金额的总和

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