The question asks to identify the originator of the '12 Rules for Relational Database'. These rules are fundamental principles for defining and managing relational database systems.
Relational Database Rules Originator
The widely accepted '12 Rules for Relational Database' were formulated by Edgar F. Codd. He is renowned for his foundational work on the relational model for database management, which forms the basis for most modern database systems, including SQL databases.
Analysis of Options
- Edgar F. Codd: Proposed the relational model and its governing principles, including the 12 rules.
- Larvy Page: Co-founder of Google, known for search engine technology.
- J. Bill Gates: Co-founder of Microsoft, prominent in software development and business.
- Linus Tolward: Developer of the Linux kernel and Git.
Based on established database theory, Edgar F. Codd is the correct authority on the '12 Rules for Relational Database'.
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?
- 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?Consider the relation T1(A,B,C,D,E) with the dependencies {EB ->C,D ->E, EA ->B} and T2(A,B,C,D) with the dependencies {C->A,A->B, A->D}. Which of the following is TRUE?
