27. CTE in SQL | SQL WITH Clause | (Common Table Expression)

Описание: CTE in SQL | SQL WITH Clause | (Common Table Expression)

A Common Table Expression (CTE) in SQL is a temporary result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement. CTEs are often used to simplify complex queries, make queries more readable, and allow for recursive queries.

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script
CREATE TABLE employees (
employee_id INT,
name VARCHAR(50),
department VARCHAR(50),
salary INT
);

INSERT INTO employees (employee_id, name, department, salary) VALUES
(1, 'Alice', 'Sales', 5000),
(2, 'Bob', 'Sales', 3000),
(3, 'Charlie', 'IT', 6000),
(4, 'David', 'IT', 7000),
(5, 'Eve', 'HR', 4000);

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what we have covered in this video:


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Hope you liked this video and learned something new :)
See you in next video, until then Bye-Bye!

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