Working and processing files, Database Management System

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1. Define each of the following IN YOUR OWN WORDS:

(a) File:

(b) Record:

(d) Primary Key:

(e) Secondary Key:

2. A travel agency wants to track the prices of its various packages. Package pricing differs by season (high and low). The input record should include package code, package description, vendor number, low season cost, low season dates (beginning and ending), high season cost, high season dates (beginning and ending), package markup percentage. Design the input record.

Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.

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Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level

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