MongoDB basic concept

collection: A collection in MongoDB is the same as a table in MySQL

SQL MongoDB explain
database database  
table collection 数据库表/集合
row document 数据库记录行/文档
column filed 数据字段/域
index index 索引
table joins   表连接，mongoDB不支持
primary key primary key 主键,MongoDB自动将_id字段设置为主键

reference: https://www.runoob.com/mongodb/mongodb-databases-documents-collections.html https://www.w3schools.com/nodejs/nodejs_mongodb_createcollection.asp https://www.w3schools.com/nodejs/nodejs_mongodb_insert.asp https://docs.mongodb.com/manual/tutorial/getting-started/