Which of the following best describes the structure of a relational database ?
Data organized into tables with rows and columns
The relational model, proposed by E. F. Codd, represents all data as relations. In practice a relation is a table: each row (tuple) is one record and each column (attribute) holds one property drawn from a domain. Relationships between tables are expressed through matching key values rather than physical links.
So the structure of a relational database is a collection of tables made of rows and columns, with primary and foreign keys connecting them.
Files and folders describe a file system, not a database model. A hierarchical tree structure is the hierarchical model (for example IBM IMS), where each child has one parent. A network of interconnected nodes is the network (CODASYL) model, where records are joined by explicit pointers.
Data organized into tables with rows and columns option is correct.
Similar Questions
The degree of a relation in database is
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?
