SQL Server – Connect to mssql database as another user

runas /netonly /user:DOMAI\Administrator “C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\Ssms.exe”

Enter the password for DOMAIN\Administrator:

Attempting to start C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\Ssms.exe as user “DOMAIN\Administrator” …