The degree of relation is a number of attribute of its relation schema. A degree of relation is also known as Cardinality it is defined as the number of occurrence of one entity which is connected to the number of occurrence of other entity. There are three degree of relation they are one-to-one(1:1), one-to-many(1:M), many-to-one(M:M).

The degree of a relation in a database management system (DBMS) refers to the number of attributes or columns in a relation (table). So, the correct answer would be:

“The number of attributes or columns in a relation (table).”