Day 1: SQL Foundations & RDBMS | 10-Day Data Engineering Course

Welcome to Day 1 of the 10-Day Data Engineering Deep Dive Series! 🚀 In this foundational session, we break down Relational Database Management Systems (RDBMS) and the essential SQL mechanics every Data Engineer must master before building pipelines. 80% of Data Engineering interviews start with a live SQL screening. In this video, you will learn how the SQL execution engine actually processes queries and how to write live aggregations and JOINs. 🔗 Explore our full live Bootcamps & register today: https://www.codingmacaw.com 📌 Key Topics Covered Concept Clarity: What is an RDBMS? Tables, Rows, Columns & Relations Database Primary Principles: Primary Keys (unique identifiers) vs. Foreign Keys (relational links) The "Big 6" Analytical Commands: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY Engine Processing: The Logical Order of Execution (FROM/JOIN ➔ WHERE ➔ GROUP BY ➔ HAVING ➔ SELECT ➔ ORDER BY/LIMIT) Mastering JOINs: INNER JOIN vs. LEFT JOIN (Venn Diagram Concept) Live Practice Queries: Basic SELECT, multi-table JOINs, aggregations with GROUP BY, and finding Top 5 customers Real-World Context: How BI Dashboards (Tableau/Looker) execute SQL under the hood 💻 Environment Setup & Live Coding Commands (Practice along using sqliteonline.com by selecting PostgreSQL or SQLite from the left menu): SQL-- Environment Setup CREATE TABLE customers ( customer_id INT PRIMARY KEY, name VARCHAR(50), country VARCHAR(50) ); INSERT INTO customers VALUES (1, 'Alice', 'USA'), (2, 'Bob', 'UK'), (3, 'Charlie', 'USA'), (4, 'David', 'India'), (5, 'Eve', 'UK'), (6, 'Frank', 'Canada'); CREATE TABLE orders ( order_id INT PRIMARY KEY, customer_id INT, amount DECIMAL(10,2), order_date DATE ); INSERT INTO orders VALUES (101, 1, 250.00, '2023-10-01'), (102, 1, 150.00, '2023-10-05'), (103, 2, 400.00, '2023-10-02'), (104, 3, 50.00, '2023-10-03'), (105, 4, 600.00, '2023-10-04'), (106, 5, 300.00, '2023-10-06'), (107, 4, 100.00, '2023-10-07'); -- Live Practice Queries -- Query 1: Basic SELECT & WHERE SELECT name, country FROM customers WHERE country = 'USA'; -- Query 2: JOINING tables SELECT c.name, o.amount, o.order_date FROM customers c JOIN orders o ON c.customer_id = o.customer_id; -- Query 3: Revenue per customer (Aggregations & GROUP BY) SELECT c.name, SUM(o.amount) as total_revenue FROM customers c JOIN orders o ON c.customer_id = o.customer_id GROUP BY c.name; -- Query 4: Top 5 customers by revenue SELECT c.name, SUM(o.amount) as total_revenue FROM customers c JOIN orders o ON c.customer_id = o.customer_id GROUP BY c.name ORDER BY total_revenue DESC LIMIT 5; Stay Connected With Us: 🌐 Website: https://www.codingmacaw.com 💼 LinkedIn:   / coding-macaw-bootcamp   📸 Instagram:   / codingmacaw   🐦 Twitter/X: https://x.com/CodingMacaw #DataEngineering #SQL #PostgreSQL #CodingMacaw #RDBMS #Database #SQLTutorial #LearnSQL #TechCareers #DataEngineeringBootcamp