[Mongodb] 2. Use mongodb --------- use compass

1. Create a database ： spot ’create database’
   
   comment1: Equivalent to a project
   users： It's like a watch

2. stay comment1 Create a new table in ：comments: spot ’create collection’
   

3. stay users Add data to

   1. stay users Click in the table ‘Insert Document’
      
      2) Input json Formatted data ：
      
      3) insert data ： Click on insert after , as follows ( _id Automatic generation , Guarantee the uniqueness of data )
      

4. Query data ： Inquire about city yes beijing The data of

   1. stay filter Input in {city: ‘beijing’}
      2) Click on find, You can find
      

5. Query data （ Multiple conditions city:shanghai, username: ‘zhangsan’）：
   1) stay filter Input in {city: ‘shanghai’, username: ‘zhangsan’}

   2. Click on find, You can find

6. Sort
   1） It opens at ‘OPTIONS’
   

   2） stay SORT Enter what fields to sort by , If the value is positive , Is positive , The value is negative. , Is flashback . Such as ： Flashback by age