the name of the table. A Relationship schema is known as a structure that can be used to describe how data is organized in tables. This structure contains no data.  A Relation is defined as a set of tuples. A relation is a set of related attributes that identify a key attribute. For example, let r be the relation which contains set tuples (t1, t2, t3, ..., tn). Each tuple is an ordered list of n-values t= (v1, v2, ...., vn).  The Degree of Relation is the number of attributes in that relation schema. The degree of relationship is also called cardinality. It is defined as the frequency of occurrence of one entity relative to the frequency of occurrence of another entity. There are three degrees of relationship: one-to-one (1:1), one-to-many (1:M), and many-to-one (M:M).