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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
explain concept of decomposition?
Data Scrubbing 70,000 records Project Description: We need services of a developer competent in data cleansing/Data scrubbing. Scope: - 70,000 records in CSV format.
what factors might influence a company to outsource its IT infrascture.
Name the metrics for selecting top algorithm There are a number of metrics for selecting top algorithm: i) Computational complexity: Computational complexity refers to eff
What is catalog in DBMS? Catalog - A relational DBMS maintains information about every table and index in which it contains. A catalog is a collection of special tables that st
Which is a valid SQL type? A valid SQL Should be in CHARACTER it is should be NUMERIC and FLOAT.
Properties of a Transaction A transaction has four main properties. These are: Atomicity Consistency Isolation or Independence Durability or Permanen
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
Creating a view: A query can be embedded within the CREATE VIEW STATEMENT A query can have complex select statements containing join, groups and sub- queries A quer
Define Database layer? The database layer defines the data formats used in the database.
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