题解 | 获取指定客户每月的消费额
获取指定客户每月的消费额
https://www.nowcoder.com/practice/ed04f148b63e469e8f62e051d06a46f5
select date_format(t.t_time,'%Y-%m') time , sum(t.t_amount) total from trade t inner join customer c on t.t_cus=c.c_id and c.c_id=101 where year(t.t_time)=2023 and t.t_type= 1 group by 1 order by 1
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