Question Type: Definition/Concept based question related to Database Management Systems.
Step-by-Step Solution:
- A relational database is a type of database that stores and retrieves data using a structured table-based format.
- The core concept of a relational database is the relationship between different tables using keys. These tables are organized into rows (records) and columns (fields or attributes).
- Option 1 (Tables) is correct because tables are the fundamental building blocks of a relational database. The data is organized into related tables, forming relationships between them.
- Option 2 (Field) is incorrect. While fields are a component of a table, they don't define the relational aspect of the database. Fields are individual attributes within a table.
- Option 3 (Records) is incorrect. Records are rows in a table representing individual data entries. They are essential but don't define the relational nature of the database.
- Option 4 (Tuple) is incorrect. A tuple is another term for a row or record in a table. It doesn't define the relational aspect itself.
Core Logic/Pattern: The core concept is the definition of a relational database and its key characteristic – the use of tables to structure and relate data.
Eliminating Incorrect Options: The incorrect options represent elements *within* a relational database but don't define what fundamentally makes it *relational*—the organization and relationships between tables.
Correct Answer: Tables
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?
