The degree of a relation in database is
the number of attribute in the relation
In the relational model a relation is a table whose columns are attributes and whose rows are tuples. Two standard size measures are defined for it (Elmasri and Navathe; Korth).
The degree (or arity) of a relation is the number of attributes in its schema. For example, STUDENT(Roll, Name, Age, Dept) has degree 4 regardless of how many rows it stores.
The number of tuples is the cardinality of the relation, a different measure that changes as rows are inserted or deleted. The number of values in a domain describes the domain of a single attribute, not the relation. The number of keys (candidate keys) is unrelated to degree.
the number of attribute in the relation option is correct.
Similar Questions
Which of the following best describes the structure of a relational database ?
An alternate key in database table is also called
Which one is correct w.r.t. RDBMS ?
Important Questions from Relational Model
Given the relational schema $R = (U,V,W, X, Y, Z)$ and the set of functional dependencies: $$\{U \rightarrow V, U \rightarrow W, WX \rightarrow Y, WX \rightarrow Z, V \rightarrow X\}$$ Which of the following functional dependencies can be derived from the above set?
- The ‘12 Rules for Relational Database’ were given by
- Which of the following statement(s) is/are FALSE in the context of Relational DBMS ?
I. Views in a database system are important because they help with access control by allowing users to see only a particular subset of the data in the database.
II. E-R diagrams are useful to logically model concepts.
III. An update anomaly is when it is not possible to store information unless some other, unrelated information is stored as well.
IV. SQL is a procedural language. - Let $R(A,B,C,D,E)$ be a relational schema with functional dependency set $F=\{A\rightarrow BC,\ CD\rightarrow E,\ E\rightarrow A\}$.
Which of the following statements is correct? Consider R (A,B,C,D,E) be relation with following dependencies:
C- >F, E- > A, EC- >D, A- >B. Which of the following is a key for R?
