Example for ER diagram part11
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Example: design as (Figures and Tables) Entity Relationship diagram for a college? We have the following statements:
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Is a picture of the movement of data between external entities and the processes and data stores within a system.
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Data flow diagrams (DFDs) provide a graphical representation of how data moves through a system. DFDs use four main symbols: processes, data stores, external entities, and data flows. They allow system analysts and users to depict and understand the flow of data in a system. DFDs come in two main types: context diagrams provide an overview of the system and its interactions, while level 0 DFDs show more detail about the system's major sub-processes, data stores, and flows at a high level. Together, DFDs enable customers and users to specify requirements by modeling the system's data flows.
Use Case Context Diagram part5
In an on-line Bookstore system, user needs to log-in first before he/she could order and purchase any desired books.
Use Case Diagrams part4
Information systems analysis and requirements analysis produces a requirements specification. This specification states the project goal and the related data storage, data movement
System Development Life Cycle part3
The system development life cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project, from an initial feasibility study, through maintenance of the complete application.
Introduction to System analysis part1
The document is an introduction to system analysis and design (SAD) provided by Dr. Mohammed Kassim. It defines a system as a combination of interrelated components working together to accomplish a task. An information system is defined as a technologically implemented medium for recording, storing, and disseminating information to support decision making. The key components of an information system are identified as people, hardware, software, data, and networks. People resources include end users and information systems specialists. Hardware resources include computers and peripheral devices. Software resources include system software, application software, and procedures. Data resources include raw data stored in databases.
Introduction to Python
This document provides an introduction to the Python programming language. It discusses that Python is an interpreted, interactive, object-oriented scripting language that is designed to be highly readable. The document outlines Python's history and key features, including being easy to learn and use, having a broad standard library, and being portable. It also discusses popular implementations of Python like CPython and how organizations like Google, Yahoo, and NASA use Python for applications such as bioinformatics, simulations, games, and networking.
(Protracted your system) حماية نظامك من الدخلاء
أن الطريقة الوحيدة
للمساعدة في مكافحة تلك المهاجمين هو منع الوصول إلى مصادر وموارد جهاز
الحاسوب من جميع الموانئ المختلفة
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Shannon code & shannon fano & huffman method - chapter three
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Example for ER diagram part11
- 1. Introdaction to Python Dr. Mohammed Kassim Page 46 Example for ER diagram Example: design as (Figures and Tables) Entity Relationship diagram for a college? We have the following statements: 1. A college contains many departments 2. Each department can offer any number of courses 3. Many instructors can work in a department 4. An instructor can work only in one department 5. For each department there is a Head 6. Each instructor can take any number of courses 7. A course can be taken by only one instructor 8. A student can enroll for any number of courses 9. Each course can have any number of students Step 1: Identify the Entities What are the entities here? 1. Department 2. Course 3. Instructor 4. Student Stem 2: Identify the relationships 1. One department offers many courses. But one particular course can be offered by only one department. hence the cardinality between department and course is One to Many (1:M)
- 2. Introdaction to Python Dr. Mohammed Kassim Page 47 Example for ER diagram 2. One department has multiple instructors . But instructor belongs to only one department. Hence the cardinality between department and instructor is One to Many (1:M) 3. One course can be enrolled by many students and one student can enroll for many courses. Hence the cardinality between course and student is Many to Many (M:M) 4. One course is taught by only one instructor. But one instructor teaches many courses. Hence the cardinality between course and instructor is Many to One (M :1) Step 3: Identify the key attributes "Departmen_Name" can identify a department uniquely. Course_ID is the key attribute for "Course" Entity. Student_ID is the key attribute for "Student" Entity. Instructor_ID is the key attribute for "Instructor" Entity. Step 4: Identify other relevant attributes For the department entity, other attributes are location For course entity, other attributes are course_name,duration For instructor entity, other attributes are first_name, last_name, phone For student entity, first_name, last_name, phone Step 5: Draw complete ER diagram By connecting all these details, we can now draw ER diagram as given below.
- 3. Introdaction to Python Dr. Mohammed Kassim Page 48 Example for ER diagram M 1 1 1 M M Department * Departmen_Name location Course * Course_ID * Departmen_Name * Instructor_ID course_name duration Instructor * Instructor_ID * Departmen_Name first_name last_name phone Student * Student_ID * Course_ID first_name last_name phone Entity Relationship (ER) model for a college M M M M M M ERD as Tables for College