Determining the database owner is important if you want to take advantage of cross-database-ownership-chaining. If databases have different owners, then you have issues with accessing objects between databases.
To find the database owners:
SELECT SUSER_SNAME(owner_sid) FROM sys.databases
To change the owner of a database:
USE database EXEC sp_changedbowner 'sa'
The standard owner for databases is usually sa.
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