Owner naming
In an ANSI-compliant database, owner naming is enforced. When you supply an object name in an SQL statement, ANSI standards require that the name include the prefix owner, unless you are the owner of the object. The combination of owner and name must be unique in the database. If you are the owner of the object, the database server supplies your user name as the default.
Databases that are not ANSI-compliant do not enforce owner naming. For more information, see the Owner Name segment in the HCL OneDB™ Guide to SQL: Syntax.