MongoDB
Basic commands
mongo mongo dbname show dbs use dbname show collections
Create a collection
db.createCollection("collectionName")
List documents in a collection
db.collection.find()
db.collection.find({'id': '210228'})
Add a document into the collection
db.collection.save({country:"England",GroupName:"D"})
Delete all documents of a collection
db.collection.remove({})
Delete a collection
db.collection.drop()