Is it possible for a table in a database to exist without being tied to a specific schema?

In most modern relational databases, tables always belong to a specific schema, which serves as a namespace for database objects. The schema helps organize and isolate tables and other objects.

For example, in PostgreSQL or Oracle, a table must be created within a schema (usually the default is the public schema). In MySQL, the concept of a schema is the same as a database, and the table belongs to a specific database.

Therefore, a table without a schema association is usually impossible, as the schema is a mandatory level of data organization in the database. If a particular DBMS does not have an explicit concept of a schema, the table still exists within the database or another container that performs a similar function.