PostgreSQL Tutorial In Hindi | Correlated Subqueries with Examples
Welcome to our in-depth tutorial on PostgreSQL Correlated Subqueries! 🚀 In this video, we'll dive into one of the more advanced SQL topics and explore how correlated subqueries can be used to solve complex database queries.
You'll learn:
What a correlated subquery is and how it differs from a regular subquery.
The syntax and structure of a correlated subquery in PostgreSQL.
Real-world examples and use cases where correlated subqueries shine.
Common pitfalls and best practices to avoid performance issues.
Whether you're a database administrator, developer, or someone keen on enhancing your SQL skills, this video has something for you. By the end of this tutorial, you'll be equipped with the knowledge to write efficient and powerful SQL queries using correlated subqueries in PostgreSQL.
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CREATE TABLE departments (
department_id SERIAL PRIMARY KEY,
department_name VARCHAR(100) NOT NULL
);
INSERT INTO departments (department_name) VALUES
('HR'),
('Engineering'),
('Marketing');
CREATE TABLE employees (
employee_id SERIAL PRIMARY KEY,
name VARCHAR(100) NOT NULL,
department_id INT NOT NULL,
salary NUMERIC(10, 2) NOT NULL,
FOREIGN KEY (department_id) REFERENCES departments(department_id)
);
INSERT INTO employees (name, department_id, salary) VALUES
('Alice', 1, 50000.00),
('Bob', 1, 60000.00),
('Charlie', 2, 55000.00),
('David', 2, 62000.00),
('Eve', 3, 58000.00);
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