List All Databases in SQL Server

In SQL Server, databases are crucial for storing and managing data efficiently. Whether we are managing a large enterprise system or a small application, understanding how to list all the databases on our SQL Server is essential. In this article, we will write SQL queries that help us to retrieve all system and user-defined databases efficiently.

How to List All Databases in SQL Server

To effectively manage a SQL Server instance, it is important to know how to list all the databases it contains. SQL Server provides two types of databases are defined below:

• System Databases: They are installed during the SQL Server installation and are used to manage and maintain the SQL Server instance.
• User-Defined Databases: They are created and managed by users to store application data.

To get a list of all databases on the SQL Server, use the following query:

SELECT name FROM sys.databases;

This command will return all databases, including system and user-defined databases. Let’s look at how to modify this query to list only system or user-defined databases as needed.

List All System Databases in SQL Server

To list only the system databases, you can filter the results by excluding user-defined databases. Here is the correct query for listing system databases:

SELECT name, database_id, create_date  
FROM sys.databases ;  

Output:

There are mainly four types of system databases:

1. master
2. model
3. msdb
4. tmpdb

Some other databases are also present in the server other than the above ones. Those can be displayed as shown below:

SELECT name FROM master.dbo.sysdatabases

Output:

List All User-Defined Databases in SQL Server

To list only user-defined databases, we can exclude the system databases by using the NOT IN clause. The correct query for listing user-defined databases is:

SELECT name
FROM sys.databases
WHERE name NOT IN ('master', 'tempdb', 'model', 'msdb');

This query will return all databases except for the system databases. Let’s create some user-defined databases for testing purposes.

Example: Creating User-Defined Databases

Now in order to select the user-defined the first let's create some databases in the server.

CREATE DATABASE GFG;
CREATE DATABASE GFG1;
CREATE DATABASE GFG2;

Output:

Query:

SELECT name  
FROM sys.Databases
WHERE name NOT IN ('master', 'tempdb', 'model', 'msdb'); 

Output:

Hence in this way we are able to select and list all the user-defined and system databases in the SQL server.

Conclusion

Listing all databases in SQL Server is a fundamental task for database administrators and developers alike. By using the SQL queries provided in this guide, you can easily retrieve a comprehensive list of both system and user-defined databases. Whether you're performing routine maintenance, monitoring your database environment, or setting up new projects, these queries will help you efficiently manage your SQL Server databases.