Which of the following is not a logical database structure?
Answer: A) Chain
A Logical Database Structure describes how data is logically organized and how different data items are related to each other in a database.
The commonly recognized logical database structures or models include Hierarchical (Tree), Network, and Relational models.
A. Chain – Correct
Chain is not generally recognized as a standard logical database model. Therefore, it is the correct answer to this question.
B. Network – Incorrect
The Network Model organizes data using records connected through links. It allows a record to have multiple relationships.
C. Tree – Incorrect
The Tree structure is commonly associated with the Hierarchical Database Model. Data is organized in a parent-child structure.
D. Relational – Incorrect
The Relational Model organizes data into tables consisting of rows and columns. Relationships between tables are established using keys.
Logical Database Structure भनेको Database मा Data कसरी व्यवस्थित गरिन्छ र विभिन्न Data हरूबीच कसरी सम्बन्ध स्थापित गरिन्छ भन्ने संरचना हो।
Database का प्रचलित Logical Models मा Hierarchical (Tree), Network र Relational Model पर्दछन्।
A. Chain – सही उत्तर
Chain सामान्यतया मान्यता प्राप्त Logical Database Model होइन। त्यसैले यो प्रश्नको सही उत्तर हो।
B. Network – गलत
Network Model मा Records हरूलाई Links मार्फत एकआपसमा जोडिन्छ। यसमा एउटा Record धेरैवटा Records सँग सम्बन्धित हुन सक्छ।
C. Tree – गलत
Tree Structure लाई Hierarchical Database Model पनि भनिन्छ। यसमा Data लाई Parent-Child Structure मा व्यवस्थित गरिन्छ।
D. Relational – गलत
Relational Model मा Data लाई Rows र Columns भएको Tables मा व्यवस्थित गरिन्छ। विभिन्न Tables बीच सम्बन्ध स्थापित गर्न Keys को प्रयोग गरिन्छ।
Exam Tip:
- Hierarchical Model: Tree Structure मा Data व्यवस्थित गर्ने।
- Network Model: Records लाई Links मार्फत जोड्ने।
- Relational Model: Tables मार्फत Data व्यवस्थित गर्ने।
- Chain: Database को प्रचलित Logical Model होइन।