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8/14/2019 Sistem Basis Data04
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Data ModelData Model
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A relational database matches databy using common characteristics
found within the data set. Theresulting groups of data are organizedand are much easier for people tounderstand.
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Model dataModel data
Abstract model that describes how dataare represented and accessed.
It show the data semantic and itsrelationships among data.
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Data representationData representation
Object-based logical model
› Entity relationship model
› Object-oriented model
› Semantic data model› Functional data model
Record-based logical model
›
Relational model› Hierarchical model
› Network model
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Hierarchical modelHierarchical model
Hierarchical model = tree model
Using parent – child model
Parent node can have 1:1 or 1:M relationbut the child node only has one parent
Child node is node under the parent node
Parent node that has no parent is called
ROOTVulnerable to data redundancy
DBMS IMS (IMB)
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Network ModelNetwork Model
consists of entities thats connected bypointer
Pointer = relation Similar to Hierarchical model but one
child is allow to have more than oneparent.
So we can have M:N relation.
Complex
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Martin Budi Kemiling
KA124 Basis Data
MID123 Struktur Data
LINK
Entity
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Relational modelRelational model
Most popular model nowadays
The idea is to describe a database as a
collection of predicates over a finiteset of predicate variables, describingconstraints on the values.
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Tabel is a very natural way to representdata.
Thats why these model is easy to used.
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Object-oriented modelObject-oriented model
This model is inspire by object orientedprogramming
In OOP, object is the main component
Ex : human as an object
information Name, sex, age, DoB.
methodWalk, talk, run, sleep.
Better then procedural
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OO implement in databaseOO implement in database
Example
Student entity has attribute
›
Std_NIM, std_Name, std_address,std_mark
They can have method
› Couting GPA
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Mahasiswa DataMahasiswa Data
NIM Student Name Address Date of Birth
980001 Ali Jl . Merdeka 2 Jan 1979
980002 Budi Jl. Gajah Mada 6 Okt 1978
990003 Imam Jl. Asri 13 Mei 1978990004 indah Jl. Adil 21 Juni 1979
What are the characteristic of this table?
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Column Tipe Size
NIM char 6
Student Name Char 20
Address Char 15DoB Date 8
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Lecturer DataLecturer Data
Lecturer Name Address
Martin Budi Jl . Merdeka
Andri Jl. Gajah Mada
Budianto Jl. Asri
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Column Tipe Size
Lecturer Name char 30
Address Char 20
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Course dataCourse data
Code Name SKS Semester
MID123 Struktur Data 4 1
KA146 Sistem Basis Data 4 1
KA123 Akuntansi 2 2IF123 Sistem Operasi Lanjut 2 3
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Have you see the relationship betweenstudent and course tables?
Column Tipe Size
Code char 6
Name Char 30
SKS Int 1Semester Int 2
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Final Mark dataFinal Mark data
Course Name NIM Student Name Final Mark
Struktur Data 980001 Ali A
Struktur Data 980004 Indah B
Sistem Basis Data 980001 Ali A
Sistem Operasi Lanjut 980002 Budi C
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The relationship sample The relationship sample
The mark table describe therelationship between the studentsand the course they had took.
1 student can have more than 1 course
1 course can be attended by more than1 student
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Column Name Type Size
Course Name char 20 NIM Int 6
Student Name Char 30
Final Mark Char 1
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Relationship student-lecturerRelationship student-lecturer
Course Name TIME Location Lecturer
Struktur Data Senin 07Senin 09
Room 101 Martin
Sistem Operasi Selasa 09 Room 303 Budianto
Sistem Basis Data Selasa 11 Room 201 Martin
Sistem Operasi Lanjut Rabu 07 Room 102 Andri
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The relationship sample The relationship sample
The time table describe the relationshipbetween the lecturers and the course.
one lecturer can have more than onecourse
one course is taught by one lecturer
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Column Name Type Size
Course Name char 20Time Int 20
Location Char 15
Lecturer Char 30
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Company has few departments, Each of them has name, unique number,employee, Start date
Department has many locations,Department control few projects thathave name and unique number and in
one place
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Employee has name, social securitynumber, address, salary, sex andbirth date.
Employee works for one departemenbut it is possible to works in manyprojects in deferent departement .
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