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 left(t_time,7) time,sum(t_amount) total from trade t inner join customer c on c.c_id=t.t_cus and c_name ='Tom' and t_time like '2023%' and t_type=1 group by left(t_time,7) order by time; 要注意消费金额,消费是1,细碎的条件不能漏了
