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What are data models? Explain it detail?
Entity relationship model
Rectangles
Ellipse
Diamonds
Lines
Relational model
Relational model use a collection of tables to show both data and the relationships between those data. Every table has a multiple columns and each columns has unique name
Other data models
Object oriented data model
Object relational data model
Network data model
Hierarchical data model
Consider the following relational database: STUDENT (name, student#, class, major) COURSE (course name, course#, credit hours, department) SECTION (section identifier, course#, sem
Explain in details about Data Sharing
What is Secondary Index While making the index, generally the index table is kept in the primary memory (RAM) and the main table, because of its size is keeps in the secondary
At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
Deadlock And Its Prevention: As seen earlier, though two phase locking protocol handles the trouble of serialisability, but it causes some troubles also. For instance, consider th
Data Handling and Research Methods: The dataset encompassing 130 participants contains several variables measuring detrimental health related behaviours referring to the use o
Explain the concept of generalization and aggregation in E_R diagrams. Give one example for each one of them? Generalization: Consider extending the entity set account throug
Design an EER schema for the following application and translate the EER schema into relational schemas (and constraints). It is possible that some requirements cannot be captured
what is specialization?
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