DATA MANAGEMENT:
ATTRIBUTE COMPONENT
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DATABASE CONCEPTS
• collection of logical and implicit data
• designed, built and populated with data for a
certain purpose
• represents certain aspects
• database model is used to describe it’s
structural concept.
– data type, relationship and dependency
between data
• a data management language to define the
data characteristics and the data structure
and to manipulate the data
• instants are data in database at a certain
period of time
LICENSE
NO_LICENSE
NRIC
D_APPR
J_LICENSE PERIOD
P_APPOVAL
HAWKERS
NRIC OWNER
NAME
DOB
ADDRESS GENDER
STALLS
SALES
NRIC OWNER
ADDRESS
SHOP OWNERS
NRIC OWNER
NAME
DOB
ADDRESS GENDER
Schema model of Data Relationship
LAND PARCEL
LOT_NO
VALUATION_PRICE
TAX_RATE
OWNERSHIP OWNER NAME
4479
50,000
200
freehold
Farid
194
700,000
5,500
lease
Sulaiman
2001
950,000
7,000
lease
Sharifah
350
25
25
freehold
Sulaiman
Database Instants
Structured Query Language (SQL)
• a non-procedural language
• user specifies what must be done, but not how
it is to be done
• uses algebra operations to perform queries
• SQL has become the catalyst in the
development of client/server and distributed
databases
• Basic form of SQL:
SELECT <attribute list>
FROM <relationship list>
WHERE <conditions>
LICENSE
LICENSE_NO NRIC_HAWKERT YEAR
423
193
701
311
4805637
5547430
6000439
3776519
1983
1992
1990
1987
LICENSE
PERIOD
APPROVAL
makanan
makanan
surat khabar
surat khabar
200
200
50
50
Ali
Samad
Samad
Ali
STORE
CATEGORY
buah-buahan
surat khabar
makanan
makanan
NRIC HAWKER
ADDRESS
4805637
6000439
3954197
5547430
Jln Tembaga Kuning, Sri Skudai
Jln Ronggeng, Skudai Baru
Jln Tembaga Merah, Sri Skudai
Jln Timah, Sri Putri
HAWKER
NRIC HAWKER NAME
7889012
6000139
2671900
DOB
Razali 08.11.65
Aminah 04.04.48
Hassan 27.03.47
ADDRESS
GENDER
45 Jln Timah 2, Sri Putri
2 Jln Timah 18 Sri Putri
14 Jln Emas 2, Sri
Skudai
lelaki
perempuan
lelaki
Database Instants
EXAMPLE OF SQL QUERY
Obtain license number and IC no. of licensee
SELECT
FROM
WHERE
LICENSE_NO, NRIC_LICENSEE
LICENSEE
LICENSE = “MAKANAN”
select tuple from relationship LICENSEE
that fulfills the condition on attribute LICENSE_NO and
NRIC_LICENSEE
BENEFITS OF DATABASE
•
•
•
•
connector between program and data
redundancy control
data sharing
data security