Total Sales Amount by Year | 1384 | Hard SQL Leetcode Problem | SQL Interview

Welcome to this SQL tutorial where we will tackle the challenging Leetcode problem "Total Sales Amount by Year" (Problem #1384).

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DDL Statements:

USE SQL_MASTER;

CREATE TABLE SQL_MASTER.PRODUCT (
product_id int,
product_name varchar(100));

CREATE TABLE SQL_MASTER.SALES (
product_id int,
period_start date,
period_end date,
average_daily_sales int
);

INSERT INTO SQL_MASTER.PRODUCT VALUES
(1,'LC Phone'),
(2,'LC T-Shirt'),
(3,'LC Keychain');

INSERT INTO SQL_MASTER.SALES VALUES
(1,'2019-01-25','2019-02-28',100),
(2,'2018-12-01','2020-01-01',10),
(3,'2019-12-01','2020-01-31',1);
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In this problem, we'll dive into the realm of recursive Common Table Expressions (CTEs) and aggregation to calculate the total sales amount by year. This problem will test your understanding of SQL syntax, recursive queries, and advanced data aggregation techniques.

Throughout this tutorial, we'll provide a step-by-step walkthrough of the problem solution, explaining the logic and concepts behind each SQL query. By the end of this tutorial, you'll gain a deeper understanding of how to leverage recursive CTEs and aggregation in solving complex SQL problems.

Whether you're preparing for a technical interview or looking to enhance your SQL skills, this tutorial will equip you with the knowledge and confidence to tackle the Total Sales Amount by Year problem and similar challenges.

Get ready to sharpen your SQL skills, unleash your problem-solving abilities, and conquer this hard Leetcode problem! Let's dive in!

? Resources:
- Leetcode Problem: [1384. Total Sales Amount by Year]
- SQL Syntax: Recursive CTEs, Aggregation
- Difficulty: Hard

Remember, practice makes perfect, and each problem you solve brings you closer to becoming a SQL master. Good luck, and happy coding!