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Comp 231 Database Management Systems

Comp 231 Database Management Systems

Comp 231 Database Management Systems. 3. Relational Data Model. Basic Concepts. Entities and relationships are stored in tables Relationships are captured by including key of one table into another Languages for manipulating the tables

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617 views • 59 slides
Unit - 5

Unit - 5

Unit - 5. Relational Algebra And Calculus. Structure of Relational Database :-. Relational database system has a simple logical structure with sound theoretical function. The relational model is based on the core concept of relation.

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661 views • 53 slides
CS320 Web and Internet Programming SQL and MySQL

CS320 Web and Internet Programming SQL and MySQL

CS320 Web and Internet Programming SQL and MySQL. Chengyu Sun California State University, Los Angeles. Web and Databases. E-commerce sites Products, order, customers News sites Subscribers, articles Web boards Users, postings

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325 views • 30 slides
CS320 Web and Internet Programming SQL and MySQL

CS320 Web and Internet Programming SQL and MySQL

CS320 Web and Internet Programming SQL and MySQL. Chengyu Sun California State University, Los Angeles. Web and Databases. E-commerce sites Products, order, customers News sites Subscribers, articles Web boards Users, postings

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281 views • 26 slides
Cohort Study Analysis

Cohort Study Analysis

Cohort Study Analysis. Standard 2 X 2 table (Relation between exposure and outcome). Two types of measures for rate. Cumulative incidence = Proportion of study subjects getting the outcome during the study period Incidence rate = New cases/ Person-time under observation.

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458 views • 20 slides

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