Creating a New User with sysadmin Privileges in SQL Server 2005

• Login: A login represents a user or process granted access to SQL Server. It can be a SQL Server login (username and password) or a Windows login (integrated authentication).
• User: A user is a database object within a specific database. It can be linked to a login or exist without one.
• Schema: A schema is a logical container for organizing database objects like tables, views, and procedures within a database.

Therefore, you cannot directly change the "dbo" name itself. It's a system-defined schema and modifying it would have unintended consequences.

Renaming a User's Login:

If your intention is to change the login credentials associated with a user, you can't achieve that through modifying "dbo." Here's the correct approach:

• Identify the user: Use the SELECT name statement from sys.sql_logins to find the login name associated with the desired user.
• Modify the login: Use the ALTER LOGIN statement with the WITH PASSWORD = clause to change the password for the identified login.

Example:

-- Find login name for user with sysadmin privileges
SELECT name FROM sys.sql_logins WHERE is_sysadmin = 1;

-- Change password for the login (replace "NewPassword123" with your desired password)
ALTER LOGIN [LoginName] WITH PASSWORD = N'NewPassword123';

Creating a New User with sysadmin privileges:

If you want a new user with sysadmin privileges and a different login, follow these steps:

• Create a new SQL Server login: Use the CREATE LOGIN statement with the desired username and password.
• Create a new user: Use the CREATE USER statement, specifying the new login name and granting the sysadmin server role membership.

-- Create a new login
CREATE LOGIN NewAdminLogin WITH PASSWORD = N'SecurePassword456';

-- Create a new user and grant sysadmin privileges
CREATE USER NewAdmin WITH LOGIN = NewAdminLogin;
ALTER SERVER ROLE sysadmin ADD MEMBER NewAdmin;