You can use a linked server in SQL Server Management Studio (SSMS) to connect to PostgreSQL. Linked servers enable you to implement distributed databases and retrieve or modify data in other databases and cloud service providers. This approach facilitates integration with heterogeneous data sources, providing a unified method for accessing and managing disparate data sets from any origin. By creating linked servers for each data source, you can perform distributed queries and transactions directly within SSMS, regardless of where your data resides.
1. In SSMS, connect to your SQL Server instance.
2. In Object Explorer, select Server Objects > Linked Servers > Providers.
3. Double-click MSDASQL, then select Allow inprocess.
4. Click OK.

5. Right-click Linked Servers, then select New Linked Server.

6. In the New Linked Server dialog, fill out the fields with the connection details:
Tip
You can enter the driver connection string in Provider string instead of specifying the Product Name and Data source.

7. Click OK.
A new linked server appears under Linked Servers.

1. On the toolbar, click New Query.
2. Enter a SQL query in the following format:
SELECT * FROM [<linked_server_name>].[<database_name>].[<schema_name>].[<table_name>];
where [<linked_server_name>] and [<table_name>] are required, and [<database_name>] and [<schema_name>] are optional.
3. Click Execute.
The results are displayed under the query text editor.
