A relation in a relational database is also known as a table.
(1) A data type: While a relation contains attributes with specific data types, the relation itself is more than just a data type.
(2) An attribute: An attribute is a column within a relation (table), but the relation is the entire table, not just one column.
(3) A schema: A schema is the overall design or structure of the database, encompassing multiple tables and their relationships.
(4) A table: A relation in a relational database is essentially the same thing as a table. It's a collection of rows and columns representing entities and their attributes.
Therefore, a relation in a relational database is also known as: (4) A table.