How can I tell if a SQL Server user is connected?

How can I see connected Users in SQL Server?

In SQL Server Management Studio, right click on Server, choose "Activity Monitor" from context menu -or- use keyboard shortcut Ctrl + Alt + A .

How can I tell if a user has access to SQL database?

Check who has access to SQL Server view1In the object explorer window, right click on the view and click on Properties.2Navigate to the Permissions tab.3Here you can see the list of users or roles who has access to the view. Also, you can see the type of access the user or role has.

How do I check if a user exists in a database?

To check if a particular value exists in the database, all you need to do is run a SELECT query.1$select = mysqli_query($conn, "SELECT * FROM users WHERE username = '". $_POST['username']."'"); if(mysqli_num_rows($select)) {2exit('This username already exists'); }

How can I tell if my SQL Server is linked?

Open SQL Server Management Studio; go to Server Objects -> Linked Server. Under Linked Server node we have Providers node that already having installed provides and that mapped to SQL Server.