SQL Unions, String Functions & Window Functions Explained!

📌 Master SQL in this tutorial! Learn how to combine tables, manipulate text, and use advanced ranking functions to improve your data analysis skills.

🔹 Topics Covered:
✔️ UNION vs UNION ALL – The right way to merge rows
✔️ String Functions – UPPER(), LOWER(), TRIM(), CONCAT() for text manipulation
✔️ CASE Statements – Adding conditional logic in SQL
✔️ Subqueries – Writing powerful nested queries
✔️ Window Functions – ROW_NUMBER(), RANK(), DENSE_RANK() for ranking

📜 Example Query:
sql
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SELECT first_name, last_name, gender, salary,
ROW_NUMBER() OVER(PARTITION BY gender ORDER BY salary DESC) AS row_num,
RANK() OVER(PARTITION BY gender ORDER BY salary DESC) AS rank_num,
DENSE_RANK() OVER(PARTITION BY gender ORDER BY salary DESC) AS dense_rank_num
FROM employee_demographics dem
JOIN employee_salary sal ON dem.employee_id = sal.employee_id;

🔹 Why SQL?
SQL is a fundamental skill for data analysts, enabling them to manage, analyze, and extract meaningful insights from databases.

💬 What’s your go-to SQL function? Let me know in the comments!

#SQL #DataAnalytics #DataScience #SQLQueries constant_learning

Видео SQL Unions, String Functions & Window Functions Explained! канала Constantlearning