PostgreSQL is one of the most advanced general-purpose Relational database management systems (RDMS). It is open-source software, which means the source code is available under the PostgreSQL license. Anyone with the right skills is free to use, modify, and distribute PostgreSQL in any form. It supports both relational as well as Non-Relational JSON Queries.
Basics
Database Operations
Data Types
Querying Tables
Table Operations
PostgreSQL - CREATE TABLE
PostgreSQL - SELECT INTO
PostgreSQL - CREATE SEQUENCE
PostgreSQL - ALTER TABLE
PostgreSQL - ADD COLUMN
PostgreSQL - DROP COLUMN
PostgreSQL - Rename Table
PostgreSQL - DROP TABLE
PostgreSQL - TRUNCATE TABLE
PostgreSQL - Copy a Table
PostgreSQL - Comparing Tables
PostgreSQL - Show Tables
Modifying Data
Conditionals
Control Flow
Transactions & Constraints
JOINS & Schemas
Roles & Permissions
Operators
PostgreSQL Functions
Errors & Exception
Advance Concepts
PostgreSQL - Dollar-Quoted String Constants
PostgreSQL - Block Structure
PostgreSQL - Variables
PostgreSQL - Introduction to Stored Procedures
PostgreSQL - Trigger
PostgreSQL - CREATE TRIGGER
PostgreSQL - DROP TRIGGER
PostgreSQL - Disabling a Trigger
PostgreSQL - Enabling a Trigger
PostgreSQL - CREATE INDEX
PostgreSQL - List Indexes
PostgreSQL - UNIQUE Index