Mysql 查询按年龄、3 个月、6 个月、9 个月和 12 个月分组

Question

+------+------------+ 
| cost | date       |
+------+------------+ 
|   44 | 2015-04-30 | 
|   39 | 2015-04-31 | 
|   18 | 2015-04-01 | 
|   71 | 2015-01-02 | 
|   69 | 2014-12-03 | 
|   62 | 2014-12-04 | 
|   89 | 2014-08-05 | 
|   72 | 2014-08-06 | 
|   46 | 2014-05-07 | 
|   23 | 2014-05-08 |
+------+------------+

根据上面的table，我想写一个查询，从现在开始，将总费用分为3个月、6个月、9个月和1年前。

请问我该怎么做？

Answer 1

您可以在 group by 中添加 case 语句：

select (case when date >= date_sub(now(), interval 3 month) then '3month'
             when date >= date_sub(now(), interval 6 month) then '6month'
             when date >= date_sub(now(), interval 9 month) then '9month'
             when date >= date_sub(now(), interval 12 month) then '12month'
        end) as grp, sum(cost) as sumcost
from table t
where date >= date_sub(now(), interval 12 month)
group by grp;

Mysql 查询按年龄、3 个月、6 个月、9 个月和 12 个月分组

Mysql query to group by age, 3 months, 6 months, 9 months and 12 months

mysql

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