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 time,SUM(t_amount) AS total
FROM (
    SELECT t_id,date_format(t_time,'%Y-%m') AS time, t_cus, t_amount,c_name
    FROM trade t, customer c
    WHERE t_type=1 AND t.t_cus=c_id AND c_name='Tom' AND year(t_time)=2023
) sub
GROUP BY time
order by time

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