获取连接后将数据库中部门信息转化为字符串集合，将雇员转化为对象集合。
再将部门示例化，将雇员加入部门单独的雇员对象集合中
由部门对象的方法将所需数据总结出，由计算对象调用完成对题目的实现。
为约束在emp表中插入行时，每一行中deptno数据，必须在于dept表中deptno列内包含
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