2026-01-14 SQL Functions – Aggregate, Scalar & Window Functions Explained (With Examples & Practice) Functions are one of the most powerful parts of SQL. Once I understood them properly, my queries went from basic to professional-level overnight. Today, we're covering the three main types of SQL... Read Article
2026-01-14 Database Normalization in SQL – 1NF to BCNF Full Guide (With Examples & Practice Questions) Normalization was one of those topics that felt super theoretical when I first read about it. I thought, "Why bother? My queries work fine." Then I saw a real messy table in an interview question... Read Article
2026-01-14 Types of Indexes in SQL – Complete Guide for Interviews Indexes were one of those topics that confused me a lot during interview prep. I knew they make queries faster, but when someone asked "What type of index would you use for full-text search?" or... Read Article
2026-01-14 Keys in SQL – Primary Key, Foreign Key, Unique Key & Composite Key Explained (With Examples & Practice) In my early days of SQL interview prep, I used to mix up Primary Key, Foreign Key, and Unique Key all the time. Interviewers love asking about keys because they test your understanding of data... Read Article
2026-01-13 Understanding Relationships in SQL - (With Examples & Practice) When I first started learning SQL for interviews, I could write basic SELECT queries just fine. But the moment they asked something like "show all orders with customer names and product details,"... Read Article
2025-12-25 Database Connection Pooling: Why It Matters in Production Systems In a production-grade application, every incoming request typically requires access to the database. The backend establishes a database connection, executes the query, returns the response, and... Read Article
2025-12-21 Mastering INNER JOIN in SQL: Complete Guide with Examples & Practice Questions (2026 Interviews) When I first started preparing for SQL interviews, INNER JOIN was the concept that tripped me up the most. I could handle single-table queries fine, but as soon as they asked something like "show... Read Article
2025-12-21 How to understand bottlenecks in sql queries Finding a bottleneck in a SQL query is a lot like being a detective at a busy intersection. You know traffic is backed up, but you need to figure out if it’s because the light is too short, the... Read Article