R Systems SQL Interview: Find Currency Exchange Rates at Month Start & End! 💰

🚀 R Systems SQL Interview: Find Currency Exchange Rates at the Start & End of the Month! 🚀

In this video, we solve a real SQL interview question from R Systems.
The goal? Retrieve the currency exchange rate at the beginning and end of each month.

📌 Topics Covered:
✅ Using MIN() and MAX() functions to get first & last exchange rates
✅ Filtering data using GROUP BY and DATE functions
✅ Optimizing SQL queries for financial data
✅ Best practices for working with time-series data in SQL

👨‍💻 Who is this for?
🔹 SQL Beginners & Experts
🔹 Data Analysts & Engineers
🔹 Financial Analysts working with SQL
🔹 Candidates preparing for SQL interviews

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💡 Got a question? Drop it in the comments!

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----------------------------Table Creation------------------------------------------------------
CREATE TABLE exchange_rates (
currency_code VARCHAR(3),
date DATE,
currency_exchange_rate DECIMAL(10, 2));

INSERT INTO exchange_rates (currency_code, date, currency_exchange_rate) VALUES
('USD', '2024-06-01', 1.20),
('USD', '2024-06-02', 1.21),
('USD', '2024-06-03', 1.22),
('USD', '2024-06-04', 1.23),
('USD', '2024-07-01', 1.25),
('USD', '2024-07-02', 1.26),
('USD', '2024-07-03', 1.27),
('EUR', '2024-06-01', 1.40),
('EUR', '2024-06-02', 1.41),
('EUR', '2024-06-03', 1.42),
('EUR', '2024-06-04', 1.43),
('EUR', '2024-07-01', 1.45),
('EUR', '2024-07-02', 1.46),
('EUR', '2024-07-03', 1.47);

Видео R Systems SQL Interview: Find Currency Exchange Rates at Month Start & End! 💰 канала The Data -Tech Club