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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
Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
WRITE SHORT NOTES ON INDEX STRUCTURE OF FILES? There are two basic parts of indices 1. Ordered indices 2. Hash indices Every technique must be evaluated on the bas
What are the two approaches to store relations in distributed database? a) Replication b) Fragmentation
The aims of the project are: 1. To enable the students to undertake the detailed design of a specific plant or process 2. The design projects includes: process selection; und
Domain Constraints Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relatio
differences between a classified catalog and a dictionary catalog
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
difference between MIS and DSS
What are the advantages of object ID? The main advantages of Object IDs are as below: i) IDs are not changing ii) IDs are completely independent of the changes in data v
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