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Real-Life Example: Tracking Employee Table Changes with Magic Tables

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 In any real-world business application, maintaining a record of data changes is essential—whether for compliance, auditing, or simply understanding who made what changes and when. While SQL Server provides built-in features like Change Data Capture and Change Tracking, these may not always be enabled or available in all editions. In this post, we’ll walk through a real-life example of how to track changes to an Employees table using Magic Tables in SQL Server trigger. This solution is simple, flexible, and works across all editions of SQL Server. What Is a Magic Table in SQL? A Magic Table in SQL refers to the internal tables— INSERTED and DELETED —that SQL Server makes available during the execution of a TRIGGER . These tables store rows affected by INSERT , UPDATE , and DELETE statements. INSERTED contains the new row versions. DELETED contains the original row versions. You can query these tables inside a trigger to understand how data has changed, enablin...
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Performance Considerations When Using Magic Tables in High-Traffic Systems

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  Magic tables in SQL Server are a powerful feature that enables you to access inserted and deleted data during INSERT , UPDATE , and DELETE operations through triggers. While they’re extremely useful for tasks like auditing and data validation, they can introduce serious performance issues — especially in high-traffic systems where large volumes of transactions occur. In this post, we’ll examine the key performance considerations when using magic tables and offer best practices to optimize their use. What Is a Magic Table in SQL? A Magic Table in SQL is a virtual, in-memory table ( INSERTED or DELETED ) created by SQL Server when a trigger is executed. These tables temporarily store the affected rows from a DML operation and are accessible only within the context of the trigger. While they are convenient for tracking changes, they can become a performance bottleneck under certain conditions. Why Performance Becomes a Concern In high-throughput systems, even small ineff...
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Understanding Data Types Through Addition in Java

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 One of the first exercises most beginners encounter when learning Java is the simple addition of two numbers . While it may appear basic, this task offers an excellent introduction to one of Java’s most important concepts — data types . In this blog post, we’ll explore how Java handles different data types during arithmetic operations, with a focus on understanding how they behave during the addition of two numbers in Java . Why Data Types Matter in Java Java is a statically typed language, which means that every variable must be declared with a specific data type. These data types not only determine what kind of data a variable can hold but also how operations like addition are carried out. For example: Integers ( int , long ) store whole numbers. Floating-point types ( float , double ) handle decimal values. Byte and short are used for smaller integer values but can also be involved in arithmetic. When you perform an arithmetic operation like addition, Java e...
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Master Serverless with AWS Lambda: A 2025 Beginner’s Guide

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  Serverless computing is transforming the way modern applications are built. Among the various tools in the AWS ecosystem, AWS Lambda stands out as the go- to service for developers aiming to build scalable, cost- effective, and event- driven applications without managing servers. As we step into 2025, mastering AWS Lambda is a crucial skill for cloud developers, DevOps engineers, and anyone entering the cloud- native world. This guide will introduce you to AWS Lambda and explain why it’s a top technology to learn, along with real- world applications and how TechnoGeeks Training Institute can help you get started. What is AWS Lambda? AWS Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying infrastructure. You simply upload your code, define the event source, and AWS takes care of the rest— scaling, patching, monitoring, and availability. You only pay for the compute time your code actually uses, making it...
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How to Find the Nth Highest Salary in SQL: A Beginner’s Guide

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 If you’re just stepping into SQL or prepping for a job interview, you’ve probably come across this common question: How do you find the nth highest salary in a table? It may seem tricky at first, but with a clear understanding of SQL's ranking and filtering features, the solution becomes much more approachable. In this beginner’s guide, we’ll explore various methods to retrieve the nth highest salary in SQL using simple examples and practical queries.  Why Is This Question So Popular? This question helps interviewers assess your ability to: Use SQL’s sorting and filtering features Work with subqueries or window functions Understand and apply ranking logic The “nth highest” concept can be applied to many real-world scenarios beyond salaries—like finding the nth top-selling product or nth most-viewed article—making it a valuable skill.  Scenario Setup Let’s say you have a table called employees like this: id name salary 1 Alice 70000 2 Bob 85000 3 Ch...
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What Is DevOps? Understanding the Basics and Its Importance in Pune's Tech Industry

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  As the software industry continues to evolve, businesses are under constant pressure to deliver faster, more reliable, and high-quality software. To meet these growing demands, organizations are increasingly adopting DevOps—a powerful approach that bridges the gap between development and operations. In a rapidly growing IT hub like Pune, DevOps is becoming a critical skill for professionals and a key investment area for companies seeking digital agility. Whether you are a student, IT professional, or hiring manager, understanding the fundamentals of DevOps and its relevance in Pune’s tech landscape is essential. What Is DevOps? DevOps is a cultural and technical movement that integrates software development (Dev) and IT operations (Ops) to improve collaboration, increase efficiency, and enable continuous delivery of software. Unlike traditional models where developers and operations teams work in silos, DevOps promotes a unified workflow that emphasizes automation, monitoring,...
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