// Query the collection under the library (similar to a relational data table)
> show collections
// 查询users集合下的所有数据
// Query all data in the ‘users’ collection
> db.users.find()
```
> 项目启动(前后端分离概念,需对应分别启动前端界面和后台接口服务)
> Project start (the concept of front-end and back-end separation, the front-end interface and back-end interface services need to be started respectively)