🧹 SQL Query to Remove Duplicate Records While Keeping the Latest Entry Duplicate data is one of the most common problems in database management. In this tutorial, you’ll learn how to remove duplicate records while keeping only the latest entry — based on a timestamp or unique ID. This technique works in MySQL, SQL Server, … Read more
👨💼 SQL Query to Find Employees Who Didn’t Attend Any Training (LEFT JOIN Example) In real-world HR and analytics systems, it’s often necessary to identify employees who have not attended any training programs. This type of query is useful in employee engagement analytics, compliance tracking, and HR dashboards. We’ll use a simple LEFT JOIN approach … Read more
“`html 🏆 SQL Query to Find Top 3 Salaries Without Using LIMIT or TOP (Step-by-Step Example) Finding the top 3 salaries in SQL is a classic interview and practical database problem. Most developers use the LIMIT (MySQL) or TOP (SQL Server) clause — but what if your system doesn’t support them, or you want a … Read more
⚡ SQL Query to Calculate Running Total Without Window Functions (Step-by-Step Example) Calculating a running total (cumulative sum) is a key task in data reporting, especially for business dashboards, financial reports, and time-based analytics. Modern databases offer SUM() OVER() window functions to handle this easily — but what if your system doesn’t support them? Don’t … Read more
🧠 SQL Query to Find Duplicate Records with Different Values (Real-World Example) Data duplication is one of the most common challenges in database management. Often, you’ll encounter duplicate records with mismatched details — such as the same employee ID appearing with different email addresses or contact numbers. These inconsistencies can cause serious reporting errors in … Read more
When working with complex queries, understanding SQL joins is essential. However, there are scenarios where alternatives like UNION, INTERSECT, and EXCEPT provide a more efficient or elegant solution. In this blog, we’ll explore these SQL join alternatives, their practical use cases, and tips to optimize your queries. Why Use SQL Join Alternatives? SQL joins are … Read more