Synonyms - SQL Server

In SQL Server, a synonym is an alternative name for an object in the database. Synonyms are often used to simplify database schema management, improve query readability, or create a level of abstraction between the application and the database.

Here are some of the key features and benefits of synonyms in SQL Server:

  • Simplify database schema management: Synonyms allow you to create a logical name for an object that can be used instead of its physical name. This can simplify database schema management and make it easier to maintain the database over time.
  • Improve query readability: Synonyms can make queries easier to read and understand, especially when working with complex database schemas that have long and complex object names.
  • Create a level of abstraction: Synonyms can create a level of abstraction between the application and the database, making it easier to change the database schema without impacting the application code.
  • Cross-database access: Synonyms can be used to access objects in other databases, without having to use a fully-qualified name or a linked server.
  • Schema separation: Synonyms can be used to separate the schema of the application from the schema of the database, providing an additional layer of security.
Creating a synonym is a straightforward process that involves defining a logical name for an object in the database. Here are the steps to create a synonym:

  • Open SQL Server Management Studio and connect to the SQL Server instance where you want to create the synonym.
  • In Object Explorer, expand the "Databases" node and select the database where you want to create the synonym.
  • Right-click on the "Synonyms" node and select "New Synonym".
  • In the "New Synonym" dialog box, enter a name for the synonym and select the base object that you want to reference.
  • Test the synonym by running a query against it to verify that it is working correctly.

Synonyms are a useful feature in SQL Server that can simplify database schema management, improve query readability, and create a level of abstraction between the application and the database. By using synonyms, you can create a more flexible and maintainable database schema that is easier to work with and manage over time.

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