Category: SQL

SQL Server table variables are a special type of variable that allows developers to store tabular data temporarily within a batch, stored procedure, or function. Introduced to provide a lightweight alternative to temporary tables, table variables are widely used for intermediate data storage, parameter handling, and small result sets. While they look similar to temporary…(Continue Reading)

Temporary tables are a powerful and commonly used feature in Microsoft SQL Server. They allow developers and database administrators to store intermediate results temporarily during query execution or within a session. When used correctly, temp tables can improve query readability, simplify complex logic, and sometimes enhance performance. However, improper usage can lead to excessive resource…(Continue Reading)

The RETURN statement in SQL Server is a fundamental control-of-flow statement used to exit immediately from a stored procedure, function, or batch and optionally return an integer status code to the calling program or batch. It is a critical tool for managing execution flow, signaling success or failure, and controlling the behavior of T-SQL modules.…(Continue Reading)

In SQL Server, control-of-flow statements allow developers to manage the execution sequence of Transact-SQL (T-SQL) code. One such control statement is the CONTINUE statement, which is used inside looping constructs to skip the remaining statements in the current iteration and immediately move to the next iteration of the loop. The CONTINUE statement is especially useful…(Continue Reading)

The BREAK statement in SQL Server is a control-of-flow language element used within loops to immediately exit the loop and transfer control to the statement following the loop. It is primarily used in conjunction with WHILE loops to provide a mechanism for early termination based on certain conditions. Purpose and Use Cases Early Exit from…(Continue Reading)

Structured Query Language (SQL) is primarily a set-based language, but there are scenarios where iterative processing becomes necessary. In SQL Server, the WHILE loop provides a way to repeatedly execute a block of Transact-SQL (T-SQL) statements as long as a specified condition remains true. In this article, you’ll learn what a SQL Server WHILE loop…(Continue Reading)

The STRING_SPLIT function in SQL Server is a powerful and efficient way to split a string into multiple rows based on a specified delimiter. Introduced in SQL Server 2016, this function has become an essential tool for developers and database administrators who frequently work with comma-separated values, dynamic lists, or delimited input parameters. In this…(Continue Reading)

Searching text efficiently is a common requirement in SQL Server–based applications. One frequent challenge developers face is building a SQL Server search query that matches all words in a string, not just one of them. In this article, you’ll learn multiple ways to search for rows that contain every word in a search string in…(Continue Reading)

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)