Category: SQL

Whether you’re preparing for a SQL Server interview or just want to sharpen your T-SQL skills, practical questions and hands-on SQL queries are the best way to learn. This article covers common and advanced SQL questions that are often asked in technical interviews, complete with clear answers and explanations. Section 1: SQL Server and T-SQL…(Continue Reading)

Foreign keys are a crucial part of database integrity in SQL Server, ensuring relationships between tables remain consistent. When working with databases, you might need to check whether a foreign key exists before creating, modifying, or deleting it. SQL Server provides multiple ways to check the existence of a foreign key, including querying system views,…(Continue Reading)

In SQL Server, the SELECT statement within a WHERE clause is a powerful technique used to filter records based on a condition derived from another query. This is commonly achieved using a subquery, which is a query nested inside another query. Subqueries can return a single value, a list of values, or even a table,…(Continue Reading)

When working with SQL Server, it’s crucial to understand how to filter and manage data effectively. Two powerful clauses, HAVING and WHERE, serve as essential tools in SQL for applying conditions and narrowing down query results. Despite their similarities, they have distinct purposes and use cases. This blog will explore their differences, similarities, and examples…(Continue Reading)

In the world of SQL Server, conditional logic is a powerful tool that enables developers to execute specific actions based on certain conditions. Among the most commonly used constructs for implementing conditional logic is the IF…ELSE statement. This versatile control-flow tool allows you to make decisions and dictate the flow of SQL script execution based…(Continue Reading)

In the modern age of data-driven decision-making, JSON (JavaScript Object Notation) has become a standard format for data exchange due to its simplicity and flexibility. SQL Server, a leading database management system, has evolved to provide robust support for JSON. One common use case is converting traditional text data into JSON format to facilitate seamless…(Continue Reading)

The digital era has brought with it an overwhelming need for data interoperability between applications. JSON (JavaScript Object Notation) has become a dominant format for data exchange due to its lightweight, easy-to-read structure. For database professionals using SQL Server, the FOR JSON clause is an invaluable tool for producing JSON data directly from relational tables…(Continue Reading)

In the modern world of data processing, JSON (JavaScript Object Notation) has emerged as a lightweight and flexible format for data interchange. It’s widely used in web applications, APIs, and various data-driven systems. SQL Server, a robust and versatile database management system, introduced the OPENJSON function to simplify working with JSON data. In this blog…(Continue Reading)

Structured Query Language (SQL) Server provides a powerful suite of functions to handle various data types, including JSON (JavaScript Object Notation). Among these is the ISJSON function, which is designed to validate whether a given expression contains valid JSON data. This blog will explore what ISJSON is, how it works, its practical applications, and tips…(Continue Reading)

The JSON_MODIFY function in SQL Server is a powerful tool used to modify the value of a specified key in a JSON string or add new keys and values to a JSON object. It is particularly useful when working with JSON data stored in database tables. Syntax JSON_MODIFY ( expression , path , newValue )…(Continue Reading)