MongoDB Query语法和工具

1.基础语法:       相关网站:  http://www.runoob.com/mongodb/mongodb-query.html

Noted: 1> can not order by multiple fields.

2>  better to use object array , not use a string to save a array data.

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2.链接DB工具     1> nosqlbooster :  https://nosqlbooster.com/downloads  

 2> studio 3T :   https://studio3t.com/download-now/    win版破解方法网站:  https://www.jianshu.com/p/cc97f31509ea