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 where left(t_time,4) = '2023' and t_cus = (select c_id from customer where c_name = 'Tom') and t_type = '1' group by 1 order by 1
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