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_time,'%Y-%m') time,
sum(t_amount) total
from trade join customer on trade.t_cus = customer.c_id
where c_name = 'Tom' and year(t_time) = 2023 and t_type = 1
group by date_format(t_time,'%Y-%m')
order by time
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