This application follows a client-server architecture where multiple clients connect to a central server and communicate in real time. It is developed using Java socket programming, multithreading, ...

对 Java 开发来说，写 SQL 哪是写代码，简直是在 “猜谜 + 渡劫”！就说要查个 “近 7 天各品类销量排名前 3 的商品”，光理清逻辑就费半天劲，一会儿忘了 GROUP BY 的字段顺序，一会儿又把 LEFT JOIN 和 INNER JOIN 搞混，写好后还得反复调试，生怕漏了筛选条件。