摘要： python， datetime is not json serializable 示例代码： ref：https://stackoverflow.com/questions/11875770/how-to-overcome-datetime-datetime-not-json-serializab 阅读全文

摘要： select order_time, max(sum_price) from (SELECT order, sum(price) as sum_price FROM orders group by order_time) as table_tmp; 阅读全文