Difference between PostgreSQL and MongoDB

03 Aug, 2021
1. PostgreSQL (Object-Relational Database) : PostgreSQL is a powerful, open source object-relational database management system (ORDBMS) with an emphasis on extensibility and standards compliance that uses and extends the SQL language combined with many features that safely store and scale the most complicated data workloads. PostgreSQL is ACID-compliant, transactional, that stores the data in the tabular format and uses constraints, triggers, roles, stored procedures and views as the core components. 
Why use PostgreSQL ?  
Free and open source.
Available in multiple languages.
Highly Extensible.
Protects data integrity.
Builds fault-tolerant environments.
Robust access-control system
Supports international characters.
Apple uses PostgreSQL!
Writing queries in PostgreSQL:  
Creating students table  
 CREATE TABLE students (id INT, name VARCHAR (100)); 
Inserting a record into students table  
 INSERT INTO students VALUES (1, 'Geeks'); 
Reading records from the students table  
 SELECT * FROM students; 
 
 
Updating records in students table  
 UPDATE students SET name="GeeksforGeeks" WHERE id = 1; 
 
Deleting records from students table  
 DELETE FROM students WHERE id = 1; 
2. MongoDB (Cross-platform Document-Oriented Database) : MongoDB is a NoSQL database where each record is a document comprising of key-value pairs that are similar to JSON objects with schemas. MongoDB is flexible and allows its users to create schema, databases, tables, etc. Documents that are identifiable by a primary key make up the basic unit of MongoDB. Once MongoDB is installed, users can make use of Mongo shell as well. Mongo shell provides a JavaScript interface through which the users can interact and carry out CRUD operations. 
In other words we can say that MongoDB is a general purpose, document-based, distributed database built for modern application developers and for the cloud era licensed under the Server Side Public License. 
Why use MongoDB?  
Scalable and can serve several machines.
It is JavaScript Based which makes it easier to use.
Has Faster response because it is a document-oriented database.
Simpler Environment Setup
It uses JSON syntax which is very easy to use and has a wide range of browser compatibility.
Data is stored in the form of JSON whether it is Objects, Object Members, Arrays, Values and Strings.
Uber and Stack Companies uses MongoDB!
Writing queries in MongoDB:  
Creating a student database  
 use student; 
Creating a students table  
 db.createCollection("students"); 
Inserting records into the students collection  
 db.students.insert 
(
    {
        "id" : 1,
        "Name" : "Harry",
                 "Team": "Geeks For Geeks"
    }
); 
Reading from the students collection  
 db.students.find({Name : "Harry"}).forEach(printjson); 
Difference between PostgreSQL and MongoDB :  
Which is best and why? 
PostgreSQL is best when : You need Standard compliant, transactional and ACID (Atomicity, Consistency, Isolation and Durability) compliant out of the box which also has a wide support for NoSQL features. 
MongoDB is best when : You need Scalability and caching for real-time analytics but is not built for transactional data i.e., accounting systems. 
kapoorsagar226
Picked
DBMS
Difference Between
SQL
Write From Home
DBMS
SQL
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Introduction of DBMS (Database Management System) | Set 1
Introduction of B-Tree
Difference between DELETE, DROP and TRUNCATE
Difference between Primary Key and Foreign Key
Indexing in Databases | Set 1
Class method vs Static method in Python
Difference between BFS and DFS
Difference Between Method Overloading and Method Overriding in Java
Differences between JDK, JRE and JVM
Difference between var, let and const keywords in JavaScript