mongodb mean stack tutorial

are learning MongoDB documents, you can compare them to data in SQL database tables. Each row in a database table can be likened to each document in the collection.Insertion of dataData insertion in MongoDB refers to the document that is being created, inserted into the specified collection.The command is as follows:Db.collectionName.insert (DOC);Official Documentation Tips:The operation would create the c

string, to save non-UTF-8 characters to the database, only use decimal data.13 Max Max Key [type number: 127]Represents the maximum possible value, the shell does not support14 min min key[type number: 255]Represents the smallest possible value, the shell does not support 15 undefined undefined{"x": undefined}16 Array array[type number: 4]Datasets can be stored in an array format, the same as an array representation in Javasript. Such as:{"X": ["Cloudev.top", "Quickcodes.net"]}Arrays can contai