T-SQL Tutorial

SQL Server Examples

SQL Server is a relational database management system (RDBMS) developed by Microsoft. It is a powerful and versatile tool that can be used to manage a wide variety of data, from small personal databases to large enterprise systems. SQL Server is a popular choice for businesses of all sizes, as it is reliable, scalable, and secure.

This article provides a collection of SQL Server examples that cover a variety of tasks, from basic data retrieval to complex data manipulation. The examples are written in T-SQL, the standard language for querying SQL Server databases.

Handle exceptions is an essential part of writing robust and reliable SQL Server applications. It helps to prevent errors from causing major disruptions and ensures that your applications can continue to function correctly. Exceptions, or errors, can occur for various reasons, such as data validation issues, constraint violations, or system errors.
RAISERROR statement allows you to generate error messages with a specific message ID, severity level, state, and optional arguments. It can be used to raise custom error messages, troubleshoot T-SQL code, return messages that contain variable text, examine data values, and control the flow of execution within TRY-CATCH blocks.
How to get SQL Server database name - a comprehensive understanding of the current database in SQL Server by employing the SELECT DB_NAME() statement.
How to get SQL Server all database names - retrieving all database names is a fundamental task for database administrators and developers alike, as it provides essential information for managing and interacting with your databases effectively.
How to get SQL Server database id - the database identifier (DBID) is a unique number assigned to each database on the server. It is used to identify the database across the server and is essential for various administrative tasks, such as accessing database information, managing database objects, and executing database-specific operations.
How to get SQL Server schema name - if you want to retrieve the schema name for a particular database object, you can use various methods and SQL queries.
How to get SQL Server schema id - each schema has a unique identifier called a schema ID, which is an integer value associated with it. You might need to retrieve the schema ID for various reasons, such as querying system views, creating dynamic SQL queries, or for administrative tasks.
How to create SQL Server temp table - unlike permanent tables, temp tables are created, used, and discarded within the context of a single database connection. They are often employed to hold intermediate results, facilitate complex queries, or store temporary data during a specific task or operation. Temp tables are automatically dropped when the session or query ends, helping to manage and organize data within a SQL Server database without the need for permanent storage.
How to get SQL Server instance name - to find out the name of your SQL Server instance, you can use T-SQL (Transact-SQL), which is SQL Server's extension to SQL. Specifically, you can use the @@SERVICENAME and SERVERPROPERTY functions.
How to get SQL Server version - to get the SQL Server version using T-SQL (Transact-SQL) function, you can use the SERVERPROPERTY function. This function provides various properties and information about the SQL Server instance, including its version number.
How to get local server name - is a crucial step in connecting to and managing your database. The local server name refers to the name of the computer hosting the SQL Server instance you want to access.
How to get all database sessions - you can retrieve information about all the active database sessions using Transact-SQL (T-SQL) by querying the system views or dynamic management views (DMVs).
How to check if a primary key exists - you can check if a primary key exists for a specific table using Transact-SQL (T-SQL) by querying system catalog views. The system catalog views store metadata information about the database objects, including tables and their associated constraints like primary keys.
How to check if foreign key constraint exists - you can check if a foreign key constraint exists by querying the system catalog views or information schema using T-SQL.
SQL Server Stored Procedure vs View - are database objects with distinct purposes. Stored procedures are used for procedural logic, data manipulation, and reusability, while views serve as a logical abstraction of data for query simplification and security.
SQL Server Stored Procedure vs Function - while both serve a similar purpose of encapsulating logic within the database, they have distinct differences in terms of their usage, capabilities, and behavior.
SQL Server Stored Procedure vs Trigger - stored procedures and triggers are both powerful tools in SQL Server that can be used to automate data operations and enforce data integrity. However, they have different purposes and are used in different situations.
SQL Server DATETIME vs DATETIME2 - SQL Server provides two data types for storing date and time values: DATETIME and DATETIME2. Both data types serve the same fundamental purpose of storing date and time information, but they have some key differences that you should consider when choosing between them for your database design.