select date_format(t_time,'%Y-%m') as 'time', round(sum(t_amount),1) as total from trade t join customer c on t.t_cus = c.c_id where c_name ='Tom' and t.t_type = 1 and year(t_time) = '2023' group by date_format(t_time,'%Y-%m') order by date_format(t_time,'%Y-%m'); date_format(t_time,'%Y-%m') 格式化日期r...