In SQL Server, each database has an associated owner, which is a principal that has certain permissions and control over the database. The database owner is a user or login that has been granted the dbo (database owner) user role for that database. The database owner has the highest level of permissions within the database and can perform administrative tasks such as creating or modifying objects, managing security, and altering the database schema.
Changing the owner of a database in SQL Server can be done for several reasons:
Security: By changing the database owner, you can ensure that the