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MongoDB - IntroductionMongoDB - InstallationMongoDB - Create & Drop Database / CollectionsMongoDB - Insert DocumentMongoDB - Datatypes

🗄️ MongoDB: Create & Drop Database and Collections

MongoDB provides commands to create, rename, and drop databases and collections. It also includes help commands to explore all available operations easily.

List all databases on the server

Example01
MongoDB Shell
NoSQL
Database
1show dbs
Query Result
JSON Output
admin   40.00 KiB
config  108.00 KiB
local   88.00 KiB
school

Switch to or create a new database

Example02
MongoDB Shell
NoSQL
Database
1use school
Query Result
JSON Output
already on db school

Delete the current database

Example03
MongoDB Shell
NoSQL
Database
1db.dropDatabase()
Query Result
JSON Output
{ "ok": 1, "dropped": "school" }

Create new collections

Example04
MongoDB Shell
NoSQL
Database
1db.createCollection("students");
2db.createCollection("library");
3show collections
Query Result
JSON Output
library
students

Rename a collection

Example05
MongoDB Shell
NoSQL
Database
1db.students.renameCollection("student_info");
2show collections
Query Result
JSON Output
library
student_info

Delete a collection

Example06
MongoDB Shell
NoSQL
Database
1db.student_info.drop();
2show collections
Query Result
JSON Output
library

Show available database operations

Example07
MongoDB Shell
NoSQL
Database
1db.help()
Query Result
JSON Output
Database Class:
getMongo                          Returns the current connection object.
getName                           Returns the name of the database.
getCollectionNames                Returns an array of collection names.
getCollectionInfos                Returns array of objects with collection info.
runCommand                        Runs an arbitrary command.
adminCommand                      Runs an admin command.
aggregate                         Runs an aggregation pipeline.
...

Show available collection operations

Example08
MongoDB Shell
NoSQL
Database
1db.student.help()
Query Result
JSON Output
Collection Class:
aggregate                         Calculates aggregate values.
bulkWrite                         Performs multiple write operations.
count                             Returns the count of documents.
countDocuments                    Returns the count matching query.
deleteMany                        Removes all documents matching query.
deleteOne                         Removes a single document matching query.
distinct                          Finds distinct values for a field.
estimatedDocumentCount             Returns count of all documents.
find                              Selects documents in a collection.
findAndModify                     Modifies and returns a single document.
findOne                           Selects one document in a collection.
...