26 Jun '12

Shiva Prasad

A collection of source codes that I wrote in VB 6.0, ASP.NET, PHP, C#.NET, VB.NET and JAVA in a course of my career as web developer and software engineer that I would like to share to my fellow programmers. Some of the codes here is not my original work that I found over the Internet and Books while I'm learning how to program. I hope you find my work useful in your learning in programming. Please share my work to other people also who interested to learn the basics of web development and programming. Thank you very much and Happy Productive Programming Everyone.

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Student Information Sytem ER Diagram

student information system er diagram

Student Information System ER Diagram (Entity Relationship Diagram) illustrate the logical structure of databases. An Entity Relationship Diagram is a piece of data-an object or concept about which data is stored.

Student Information Sytem ER Diagram

There are three types of relationships between entities:

  • one-to-one (1 to 1): one instance of an entity (A) is associated with one other instance of another entity (B). For example, in a database of employees, each employee name (A) is associated with only one social security number (B).
  • one-to-many (1 to N): one instance of an entity (A) is associated with zero, one or many instances of another entity (B), but for one instance of entity B there is only one instance of entity A. For example, for a company with all employees working in one building, the building name (A) is associated with many different employees (B), but those employees all share the same singular association with entity A.
  • many-to-many (N to N): one instance of an entity (A) is associated with one, zero or many instances of another entity (B), and one instance of entity B is associated with one, zero or many instances of entity A. For example, for a company in which all of its employees work on multiple projects, each instance of an employee (A) is associated with many instances of a project (B), and at the same time, each instance of a project (B) has multiple employees (A) associated with it.

 

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  • SallapM

    Great work

    • admin

      Thanks sallapm

  • http://www.facebook.com/obeigh Kevin Obeigh

    jeah!! juz gued

    • admin

      Thanks kevin

  • uch

    hi, this work is awesome and would like o say keep up the good work.
    please i have a project on parents-students mobile information app, whereby parents can view their children’s performance anywhere in the world from their mobile phones…..please can you help me with that?
    thanks

  • roya

    Hi Can you please someone who knows a er diagram of railway information system would provide me

    • omega ram bharti

      yes baccha

  • Kinjal

    Can you provide me city information srs

  • Mubera

    Very great work !