http://sif.uin-suska.ac.id/ http://fst.uin-suska.ac.id/ http://www.uin-suska.ac.id/

1. RELATIONAL DATA BASE WITH
ERD (ENTITY RELATIONSHIP DIAGRAM)
Iqbal Rahman
Program Studi S1 Sistem Informasi
Fakultas Sains dan Teknologi
Universitas Islam Negeri Sultan Syarif Kasim Riau
http://sif.uin-suska.ac.id/
http://fst.uin-suska.ac.id/
http://www.uin-suska.ac.id/

2. Database

3. The term "database" originated from computer science.
Although the later means more extensive, include things
outside the field of electronics, this article on computer
databases. Similar records to the database actually existed
before the industrial revolution in the form of ledgers,
receipts and data related to business.

4. Databases or databases, or often spelled
databases, are collections of info stored in the
computer systematically so that it can be checked
using a computer program to obtain information
from the database. The software used to manage
and call queries is called database management
system (DBMS). The database system can be
learned in information science.

5. Relationship Model
Database

6. The Relational model for database management is
a database model based on first-order logic, first
formulated and proposed by Edgar F. Codd in
1969. In relational database models, all data is
represented in tuples, combined in relations. The
database organized in the case of a relational
model is a relational database.

8. The purpose of this relationship model is to
provide a declarative method for specifying data
and queries: the user directly states that the
information from the database contains what
information and information they want, and let the
database management software system organize
data structures related to data storage and repair
procedures for answer the query.

9. The main idea of the relational model is to describe the
database as a collection of predictive mathematical logic in a
limited set of predictive variables, explaining constraints on
possible values and value combinations. The contents of the
database at the given time is a limited logical model of the
database. An example of a set of relations, one per predictive
variable, like all the basic variables desired. Requests for
information from the database (database queries) are also
called predictive.

10. ERD
ENTITYRELATIONSHIP DIAGRAM

11. ERD is a model to explain the relationship
between data in the database based on the
basic objects of data that have relationships
between relations.ERD to model the data
structure and relationships between data, to
describe it used some notations and
symbols.

12. Basically there are three symbols used, namely:
RELASI
ENTITY
ATRIBUT

13. Entity is an object that represents something real and can
be distinguished from something else (Fathansyah, 1999:
30). The symbol of these entities is usually described by a
rectangle. Example
�� Individuals : employees, customers, students,
distributors.
�� Venue : room, building, office, field, campus.
�� Object : books, motors, software packages,
�� Event : registration, ordering, billing
ENTITY

14. Each entity must have an element called
attribute that serves to describe the
characteristics of the entity. The contents of
the attribute have something that can
identify the contents of each element with
another. Image attributes are represented by
ATRIBUT

15. The relationship between a number of entities
derived from different entity sets. Relationships
can be described as follows. Example :
�� Customer Attribute
�� No KTP/SIM
�� Name
�� Address
RELASI

16. Receipt

17. produk
ProdukID KodeBarang NamaBarang JumlahStock
11101 tokenListrik 10
produk
ProdukID KodeBarang NamaBarang JumlahStock
11101 tokenListrik 10

18. Data PLN
PRODUK TOKEN
DATA PRODUK
Penjualan
Indomaret
Harga Total Harga
Chasier Indomaret