Relations in MongoDB: One-to-One, One-to-Many, Many-to-Many In MongoDB, one-to-one, one-to-many, and many-to-many relations can be implemented in two ways: 1. Implement Relation using Embedded Document You can include related data as embedded documents. For example, you can include an address as an embedded document, as shown below. 2. Implement Relation using Reference Another way to … Read more
MongoDB Documents: Document, Array, Embedded Document In relational database management systems (RDBMS), data is organized in tables composed of rows and columns. Similarly, in MongoDB, data is organized in collections, which can contain multiple documents. These documents can be seen as equivalent to rows in a table, and each document consists of multiple fields that … Read more
MongoDB Collections A Collection in MongoDB is similar to a table in RDBMS. MongoDB collections do not enforce schemas. Each MongoDB collection can have multiple documents. A document is equivalent to row in a table in RDBMS. Create Collection To create a collection, use the db.createCollection() command. The following creates a new employees collection in the current selected database. … Read more
Delete a Database in MongoDB To delete a database, use the db.dropDatabase() method which deletes a current database. Above, { ok: 1, dropped: ‘humanResourcedb’ } indicates that the database deleted successfully. Note: Method names are case sensitive. So, executing db.dropdatabase() will throw an error.
Create a New Database and Collection To create a new database, issue the use <db> command with the database that you would like to create. For example, the following commands create both the database myNewDatabase and the collection myCollection using the insertOne() operation: If a collection does not exist, MongoDB creates the collection when you first store data for that collection.