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') as time,sum(t_amount) as total
from trade
where t_cus =(
select c_id
from customer
where c_name='Tom'
)
and year(t_time)='2023' and t_type=1
group by time
order by time
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