1. Interaction & Database
Databases using on the web
• WordPress: Blog /Web Application
example: Forum
• Joomla & Drupal: CMS example:
Enterprise CMS (ECMS), Web CMS
(WCMS) etc.
• osCommerce & Magento: WebShop

2. Classfied database Types
Biblographic:
Examples title, abstract and may
also include
links
to
full-­‐text
content
Title Title of the document
Publication Format Type of document (journal article, fact sheet, video, etc.)
Source Publisher or producer of item
Abstract Short overview of item
Descriptors Words used as index terms to aid in searching
Availability Information on where to get item and how much it costs
Audience For whom the publication is produced
Language Language of the document
Physical Details about materials, patient supplies, or accessories
Description

3. Classfied database Types
Full Text: Type of search
• Two words near each other
• Any word derived from a particular root (for example
run, ran, or running)
• Multiple words with distinct weightings
• A word or phrase close to the search word or phrase

4. Classfied database Types
Numeric:
Name Storage Size Description Range
smallInt 2 bytes small-range integer -32768 to +32767
integer 4 bytes usual choice for integer -2147## to +2147##
bigInt 8 bytes large-range integer -92233## to 92233##
decimal variable user-specified precision, exact no limit
numeric variable user-specified precision, exact No limt
real 4 bytes variable-precision, inexact 6 decimal digits precision
Double 8 bytes variable-precision, inexact 15 decimal digits precision
precision
serial 4 bytes large auto incrementing integer 1 to 2147483647
bigSerial 8 bytes large auto incrementing integer 1 to 9223372036854775

5. Classfied
database
Types
Image: In wordPress
• The user selects a file from their local file system
using the upload field shown
• They then click the "Upload" button which then
checked the posted content to see if there is actually
an image and just edit and save file

6. Database & SQL
SQL
-­‐
Structured Query Language
• Gives you access to databases
• With SQL you can manipulate data in
database

7. Database & SQL
ER-diagram: showing
the
rela6on
between
the
different
en66es
of
a
database
system
Entity A Rela6on
Entity B

8. Database & SQL
Relations/cardinalities:
1 – 1 relation 1 1
1 – m relation 1 m
m – n relation m n

9. Database & SQL
One to one relationship:
• Tables are associated only once from both sides
Countries
table
Capital
ci4es
table
Denmark
Copenhagen
Sweden
Stochklom
Finland
Helsink

10. Database & SQL
One to many relationship:
• Each record in the first table can have many matching records in second
table
• But a record in second table has only one matching record in first table
Student
table
Student
phone
table
S_id
Name
City
S_id
Phone
1
7534313
1
Lamin
Kolding
1
0391643569
2
Vaidas
Arhus
2
7597696
3
James
vyley
2
0303030303
4
paul
Allbru
3
7592077
5
Saren
Estberg
3
09798303269
4
77411198
4
4466596565

11. Database & SQL
Many to many relation:
• Each record in the first table can have many matching records in second
table
• A record in second table can have many matching records in first table
Name
table
Phone
table
Mamie
Bajo
7534313
Yuspha
Barrow
7533124
7534313
7533124

12. Database & SQL
Database normalization:
• First normal form requires no multi-valued
attributes
• Eliminate duplicative columns from the same table
• Create separate tables for each group
Student
courses
table
Student
courses
table
StudentId
Course
12345
3100,3600,3900
Student Course1
Course2
Course3
Id
54321
1300,
2300,
1200
12345
3100
3600
3900
54321
1300
2300
1200

13. Database & SQL
Database normalization:
• First Normal form is satisfied
• The proper way to store this data
Student
courses
table
StudentId
Course
12345
3100
12345
3600
12345
3900
54321
1300
54321
2300
54321
1200

14. Database & SQL
The DML part of SQL:
• SELECT - extracts data from a database
• UPDATE - updates data in a database
• DELETE - deletes data from a database
• INSERT INTO - inserts new data into a database

15. Database & SQL
DDL statment in SQL:
• CREATE DATABASE - creates a new database
• ALTER DATABASE - modifies a database
• CREATE TABLE - creates a new table
• ALTER TABLE - modifies a table
• DROP TABLE - deletes a table
• CREATE INDEX - creates an index (search key)
• DROP INDEX - deletes an index

16. Database & SQL
SQL select statment:
• The SELECT statement is used to select data from a
database
• Syntax: SELECT LastName,FirstName FROM
Persons
Person
table
P_id
LastName
FirstName
Address
City
1
Jabang
Kebba
Skovvejen
14
Kolding
2
Bojang
Buba
Newstreet
2
Arhus
3
Sabally
Ramu
Avenu
11
Copenhagen

17. Database & SQL
SQL select statment continue:
• Now I want to select the content of the columns named
"LastName" and "FirstName" from the previous table
• It gives the following result
Person
table
LastName
FirstName
Jabang
Kebba
Bojang
Buba
Sabally
Ramu

18. Database & SQL
Conclusion: The end!