Web app development_database_design_11

Jul 19, 20130 likes682 views

The document describes the design of a database for a company. It outlines the main entities (departments, projects, employees, dependents), their attributes, and their relationships. Employees work for departments and on projects. Departments manage projects. Employees can also manage departments. Dependents have a partial key dependency on employees. The document explains weak entity types and their identifying relationships. It concludes by defining total and partial dependency in an entity relationship diagram.

hasen@microcis.net July 18, 2013Hassen poreya
Trainer, Cresco Solution
Afghanistan Workforce
Development Program
Database Design
Entity Relationship (ER)-Model

Company Database
 The company is organized into DEPARTMENTS.
Each department has a name, number and an
employee who manages the department. A
department also may have several locations.
 Each department controls a number of PROJECTs.
Each project has a unique name, unique number,
and a location.

Company Database
 We have entity EMPLOYEE that stores each
employee’s name, social security number, gender,
salary, and birthdate.
 Each employee works_for one department.
 Each employee also works_on several projects.
 An employee also manages a department.

Company Database
 Each employee may have a number of
DEPENDENTS.
 For example, wife, son, and …
 For each dependent we consider a name, gender, and
relationship to the employee

Weak Entity Type
 An attribute does not have an key attribute.
 A weak entity type must participate in an
identifying relationship type with an owner or
identifying entity type.
 Entities are identified by:
 A partial key of the weak entity type
 The particular entity they are related to in the
identifying entity type.
 Example –> next slide

Weak Entity Type - Example
 A DEPENDENT entity is identified by the
dependent’s firstname and the specific EMPLOYEE
with whom the dependent relate to.
 Name of the dependent is the PARTIAL KEY.
 DEPENDENT is a weak entity type.
 EMPLOYEE is its identifying entity type via the
identifying relationship type of DEPENDENT_OF

Terminologies and Notations
 Total dependency
 The existence of an entity is totally dependent on
another entity is called total dependency.
 Shown by double line in ER-diagram.
 Partial dependency
 Exists without any dependency.
 Shown by single line.

hasen@microcis.net July 18, 2013Hassen poreya
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Any Questions!
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OM Presentation.pptx................................SandeepMohapatra34

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Web app development_database_design_11

1. hasen@microcis.net July 18, 2013Hassen poreya Trainer, Cresco Solution Afghanistan Workforce Development Program Database Design Entity Relationship (ER)-Model

2. ER-Diagram Notations

3. Company Database  The company is organized into DEPARTMENTS. Each department has a name, number and an employee who manages the department. A department also may have several locations.  Each department controls a number of PROJECTs. Each project has a unique name, unique number, and a location.

4. Company Database  We have entity EMPLOYEE that stores each employee’s name, social security number, gender, salary, and birthdate.  Each employee works_for one department.  Each employee also works_on several projects.  An employee also manages a department.

5. Company Database  Each employee may have a number of DEPENDENTS.  For example, wife, son, and …  For each dependent we consider a name, gender, and relationship to the employee

6. Company Database

7. Weak Entity Type  An attribute does not have an key attribute.  A weak entity type must participate in an identifying relationship type with an owner or identifying entity type.  Entities are identified by:  A partial key of the weak entity type  The particular entity they are related to in the identifying entity type.  Example –> next slide

8. Weak Entity Type - Example  A DEPENDENT entity is identified by the dependent’s firstname and the specific EMPLOYEE with whom the dependent relate to.  Name of the dependent is the PARTIAL KEY.  DEPENDENT is a weak entity type.  EMPLOYEE is its identifying entity type via the identifying relationship type of DEPENDENT_OF

10. Terminologies and Notations  Total dependency  The existence of an entity is totally dependent on another entity is called total dependency.  Shown by double line in ER-diagram.  Partial dependency  Exists without any dependency.  Shown by single line.

11. hasen@microcis.net July 18, 2013Hassen poreya Trainer, Cresco Solution Any Questions! Afghanistan Workforce Development Program

Web app development_database_design_11

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