When you do the install, you will input the creds to connect to the SQL and the SEPM install will create everything it needs. So you're correct ;)
But for proof, see the first part of this article:
http://www.symantec.com/docs/TECH192646
"Note: This procedure is optional when installing of the Symantec Endpoint Protection Manager (SEPM). The SEPM installer will create the necessary database and user during installation. This procedure should only be followed in environments where database rights and permissions are tightly controlled, or highly customized database settings are required."