Nguen le loi(bkc12205)-assignment 1 lan2-database and
development
Database (IT3292E)
PROGRAM TITLE: BTEC in Computing
UNIT TITLE: Unit 1:Database Design and Development
ASSIGNMENT NUMBER: Assignment 1
ASSIGNMENT NAME: Database Design and Development
SUBMISSION DATE: 14/4/2022
DATE RECEIVED: 14/4/2022
TUTORIAL LECTURER: NGUYEN QUANG HUY
WORD COUNT:4879
STUDENT NAME:Nguyễn Lê Lợi
STUDENT ID: BKC12205
MOBILE NUMBER: 0363074734
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Higher Nationals
Assignment Brief – BTEC (RQF)
Higher National Diploma in Computing
Student Name/ID Number
Unit Number and Title
Unit 1: Programming
Academic Year
2021 - 2022
Unit Tutor
Nguyen Ngoc Tan
Assignment Title
Assignment BKC
Issue Date
Submission Date
IV Name & Date
Submission Format
1.
2.
3.
Design with evaluations
Presentation or Demonstration and evidence of testing of fully functional database
Technical and User documentation
Unit Learning Outcomes
LO1 Use an appropriate design tool to design a relational database system for a substantial
problem.
LO2 Develop a fully functional relational database system, based on an existing system
design.
LO3 Test the system against user and system requirements.
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LO4 Produce technical and user documentation.
Assignment Brief and Guidance
You have been employed as a Database Developer at a large IT consultancy company. BKC, a
local double-glazing company, has approached your company as they are rapidly expanding.
New housing developments, as a result of the government’s program of regenerating the old
disused factory complexes outside the city of Sheffield, have caused a huge increase in the
demand for their products and services from building contractors.
BKC has, to date, managed their business by using a computerized system which was developed
by a college student five years ago. The system is now too slow, and no system documentation
was produced when it was implemented so changes to the system cannot be made easily. The
CEO of BKC feels that, as their business requirements have changed, to grow and manage their
business successfully they need to invest in new technology and a new system.
They currently have sales agents who follow up sales leads which are mainly generated from
their marketing material and calls taken by staff in the company office. Sales are also generated
by the agents who visit building contractors. Each visit from lead results in a quote and some of
these quote’s result in an actual sale, either to supply only or to supply and install.
BKC supplies a huge range of windows and doors. They buy most of their products in bulk from
a few large manufacturers and store the products in their warehouse. They also make some
bespoke windows and doors in their workshop in the warehouse.
Your company has accepted the contract to develop a database system for BKC and to provide
the necessary technology to run the system. Your brief is to develop the database system element
of the contract from BKC.
You have been asked by your manager to investigate the system requirements, design, create and
implement the system. One of the requirements of the contract is that user and technical
documentation be made available to BKC.
Part 1 (LO1)
Before you start the development process, your manager has asked you to produce a detailed
report for the CEO of BKC.
Using appropriate tools and techniques, you will produce a comprehensive design for a fully
functional relational database system which will include at least four example tables, interface,
and output designs, data validations, and cover data normalization. They would also like you to
evaluate your design with the client’s requirements.
Part 2 (LO2 & LO3)
Once the designs have been accepted by your manager, you have been asked to develop,
implement, and test the database and then produce a presentation or demonstration for
representatives of BKC.
The client wants to be shown evidence of input and output interfaces, as well as evidence for
results and data validation. Utilizing a query language, evidence, and assessing the quality of the
data across multiple tables. Consideration should also be given to security and ongoing
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maintenance issues. Evidence and assess your testing against the client’s requirements, including
how the choice of test data impacted the effectiveness of the testing and suggest improvements to
the system.
Part 3 (LO4)
Finally, BKC has asked that technical and user documentation be also produced for distribution
to a staff of varying computer literacy to help them navigate the database’s interfaces. To aid
future maintenance and continued system effectiveness, the flow of data through the system
should be shown as well as suggested improvements to the database system.
Pass
Merit
LO1. Differentiate between the role of a leader and the
function of a manager.
M1. Produce a
P1. Design a relational
comprehensive design for a
database system using
fully functional system which
appropriate design tools and
techniques, containing at least includes interface and output
designs, data validations and
four interrelated tables, with
data normalisation.
clear statements of user and
system requirements.
LO2. Develop a fully functional relational database system,
based on an existing system design
P2 Develop the database
system with evidence of user
interface, output, and data
validations, and querying
across multiple tables.
M2 Implement a fully
functional database system
which includes system
security and database
maintenance.
M3 Assess whether
meaningful data has been
extracted through the use of
query tools to produce
appropriate management
information.
LO3 Test the system against user and system requirements
P4 Test the system
M4 Assess the effectiveness
against user and system
of
requirements.
the testing, including an
explanation of the choice of
test data used.
LO4 Produce technical and user documentation
P3 Implement a query
language into the relational
database system.
P5 Produce technical and
M5 Produce technical and
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Distinction
D1. Evaluate the
effectiveness of the design in
relation to user and system
requirements.
LO2 & 3
D2 Evaluate the effectiveness
of the database solution in
relation to user and system
requirements, and suggest
improvements
D3 Evaluate the database in
terms of improvements
needed to ensure the
continued effectiveness of
the system.
user documentation.
user documentation for a
fully functional system,
including diagrams showing
movement of data through the
system, and flowcharts
describing how the system
works.
Table of contents
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LO1.Use an appropriate design tool to design a relational database system for a critical problem
P1.Design a relational database system using appropriate design tools and techniques, containing
at least four interrelated tables, with clear statements of user requirements and systems
M1.Creates a comprehensive design for a fully functional system including interface and output
design, data validation, and data normalization.
D1.Evaluates the effectiveness of the design in relation to user and system requirements
LO2.Develop a fully functional relational database system, building on the existing system
design
P2.Develop a database system with proof of user interfaces, outputs, and data validation and
queries across multiple tables.
P3.Implement a query language into a relational database system
M2.Implement a fully functional database system including system security and database
maintenance.
M3.Assess whether meaningful data has been extracted through the use of query tools to
generate appropriate management information
LO3.System testing according to user and system requirements
P4. Check User and System Requirements
M4. Evaluation of the effectiveness of the trial, including an explanation of the selection of test
data used
D2.Performance of the database solution regarding user and system requirements, and
recommending improvements
D3. Improvements may be required to ensure the continued effectiveness of the database system
LO4.Production of technical and user documentation
P5.Producing technical and user documentation
M5.Create technical and user documentation for a fully functional system, including diagrams
that show the movement of data through the system and flowcharts that describe how the system
works
INTRODUCE
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You have been employed as a Database Developer at a large IT consulting company. BKC, a
local double-glazing company, has approximated your company as they are rapidly expanding.
New housing developments, as a result of the government's program of regenerating the old
disused factory complexes outside the city of Sheffield, have caused a huge increase in the
demand for their products and services from building contractors. BKC has, to date, managed
their business by using a computerized system which was developed by a college student five
years ago. The system is now too slow, and no system documentation was produced when it was
implemented so changes to the system cannot be made easily. The CEO of BKC feels that, as
their business requirements have changed, to grow and manage their business successfully they
need to invest in new technology and a new system. They currently have sales agents who follow
up sales leads which are mainly generated from their marketing material and calls taken by staff
in the company office. Sales are also generated by the agents who visit building contractors.
Each visit from lead results in a quote and some of these quote’s result in an actual sale, either to
supply only or to supply and install. BKC supplies a huge range of windows and doors. They buy
most of their products in bulk from a few large manufacturers and store the products in their
warehouse. They also make some bespoke windows and doors in their workshop in the
warehouse. Your company has accepted the contract to develop a database system for BKC and
to provide the necessary technology to run the system. Your brief is to develop the database
system element of the contract from BKC. You have been asked by your manager to investigate
the system requirements, design, create and implement the system. One of the requirements of
the contract is that user and technical documentation be made available to BKC.
LO1.Use an appropriate design tool to design a relational database system for a critical problem
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P1.Design a relational database system using appropriate design tools and techniques, containing
at least four interrelated tables, with clear statements of user requirements and systems
1. Problem statement
To date, BKC has operated its company using a computer system created by a university
student 5 years ago. The system is currently too slow, and since no system documentation was
created when it was developed, it was difficult to make improvements. BKC executives believe
that, as their business needs have evolved, they must adapt to successfully expand and operate
the company.
2. Describe the binding of the objects of interest
A. Admin panel
Field Name
Admin_id
Data type
int
Field Size
11
username
password
name
Varchar
Varchar
Varchar
32
32
128
Description of attribute
Primary key and let this
field increment ítelf
Use name
pasword
name
Field Name
Data Type
Field Size
Description of attribute
Employee_id
Varchar
10
Id employee
Name
Varchar
50
name
email
Varchar
50
Email use to login
phone
Varchar
15
Phone of employee
password
Varchar
40
Pasword use to login
created
int
11
Member registration time
address
Varchar
128
address
Data Type
Field Size
Description of attribute
B. Table employee
C. Customer
Field Name
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Customer_id
Varchar
10
Id customer
name
Varchar
50
Name of customer
address
Varchar
50
Address of customer
phone
Varchar
15
Phone of customer
D. Transaction
Files name
Data type
Files size
Description of attribute
Transaction_id
Product_id
Employee_id
Date_invoice
Date_receipt
amount
payment
Varchar
Varchar
Varchar
Date
Date
demical
Varchar
10
10
10
id transaction
Id product
Id employee
Invoice date
Date of receipt of goods
total payment
The name of the payment
gateway that the customer
chooses to pay
15,2
32
E. Product
Field Name
Data Type
Field Size
Description of attribute
Product_id
Varchar
10
Id product
name
Varchar
10
Name product
image
Text
price
decimal
Image product
9,2
Price product
E. Order
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Files name
Data type
Field size
Description of attribute
Order_id
Varchar
10
id order
Transection_id
Varchar
10
id transection
Product_id
qty
amount
status
Varchar
int
demical
tinyint
10
11
15,2
4
Id product
The number of products
Order amount
status
Data type
Varchar
Varchar
Varchar
decimal
int
Field size
10
10
10
9,2
10
Description of attribute
Id of order detail
Id of product
Id of order
price
quantity
F. Order detail
Field name
Order_detail_id
Product_id
Order_id
price
quantity
M1. Create a comprehensive design for a fully functional system including interface and output
design, data validation, and data normalization.
 A category can have products but a product can only belong to one category => the
relationship between Category and Product is One to Many
 An account belongs to an employee and 1 employee has only an account => the
relationship between account and employee is one to one
 One employee can import many products and one product can be imported by many
employee => the relationship between Employee and Product is Many to Many
 A customer can have many orders, but an order can only belong to one customer =>
the relationship between Customer and Order is One to Many
 A product can have many orders and an order can also have many products => the
relationship between Product and Order is Many to Many

ERD is a diagram, showing the entities in the database, and the relationship
between them.
 Some tools features to draw ERD:
 DeZign for Databases:
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
Drag-and-drop user interface

Entity Relationship Diagramming

Multiple display modes

Industry-standard design notations

Multiple display modes

Pan and zoom window

ER-Modeling

Forward engineering

Reverse engineering
 Gleek.io

Keyboard-based user interface

Rapid Diagramming

Version Control

Live Collaboration

Diagram export

Design templates

Customization
 dbdiagram.io

Generates SQL statements

Exports to images and PDFs

One-click sharing

Integrates with SQL databases
 ERDPlus
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
User-friendly interface, easy to use

Full EDR vẽ drawing features
Through the above features, I use ERDPlus to draw Diagram to Relation
Diagram.
D1. evaluates the effectiveness of the design in relation to user and system requirementsEntityrelational model
Is a high-level conceptual data model that systematically analyzes data requirements to create a
best-in-class database. Entity-relationship model represents entities and the relationships between
them. Deploying this model is an effective method of working before deploying on the DBMS.
The entity-relational model was proposed by Peter Chen in 1971 to create a unified convention
that could be used for relational and network databases. Besides, he also uses the model to
approach the conceptual modeling.

Entity Relationship Diagram
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Entity-relationship diagrams, abbreviated as ERDs, represent the relationships of a collection of
entities stored in a database. Diagrams assist in explaining the logical structure of the database.
The ERD includes many specialized symbols, and its meanings make this pattern unique.

Why use entity-relationship diagrams?
Helps define terms related to entity-relationship modeling.
Give a preview of how all the tables in the DBMS will be connected, what fields or attributes
will be present on each table.
Describe entities, attributes, and relationships.
Entity-relationship diagrams can be converted to relational tables, thus allowing for rapid
database construction.
Entity-relationship diagrams are used by database designers as a blueprint for implementing data
in applications and software.
ERD allows to convey the logical structure of the database to the user.

-
Methods for Effective ERD Implementation
Remove any redundant entities or relationships.
Make sure that all entities and relationships are properly labeled.
Make sure that the entity-relationship diagram supports all the data that needs to be
stored.
Ensure that each entity appears only once in the ER diagram.
Name every relationship, entity, and attribute shown on the diagram.
Never associate relationships with each other.
Color can be used to highlight important parts of the diagram.
LO2. Develop a fully functional relational database system, building on the existing system
design
P2 Develop a database system with proof of user interfaces, outputs, and data validation and
queries across multiple tables.
1. Database Design
Database is a system of structured information, stored on storage devices to satisfy the
requirements of simultaneous information extraction of many users or many applications running
at the same time. with different purposes.
DBMS (Database Management System) is software to help manage databases. DBMS provides
users with functions such as creating, retrieving, updating and managing data on a database.
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In addition to data management functions, database management systems also provide users with
functions to control read/write access, specify report generation, and analyze usage.
With most DBMSs today, we will often need to use SQL (structured query language) to interact
with the database.
Popular DBMS Software
Here is a list of some popular DBMS systems including open source and privately owned
software:
• MySQL: Free and open source.
• MariaDB: Free, open source.
• PostgreSQL: Free, open source.
• SQLite: Free, open source.
• Oracle Database: Privately owned by Oracle, for a fee.
• SQL Server: Privately owned by Microsoft, for a fee.
• Microsoft Access: Privately owned by Microsoft, for a fee.

Flexible and easy to use
You can modify the source code to meet your needs at no extra cost. The installation process is
also very simple and usually takes no more than 30 minutes.

High performance
Many server clusters use MySQL. No matter you store large data of e-commerce sites or ITheavy businesses, MySQL can handle it with smooth, high speed.

Industry standards
The data and technology industry has used MySQL for many years so it is a fundamental skill
for a professional programmer. MySQL users can also deploy projects quickly and hire data
experts for a fee if they need to.

Safety
Data security is always the most important issue when choosing RDBMS software. With its
decentralized access and account management system, MySQL sets very high security standards.
Credential encryption and host authentication are both available.
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From the above priorities, we will choose the site using MY SQL to deploy the project's database
 Create the required tables
 Create admin table
CREATE TABLE `admin` (
`admin_id ` tinyint(4) NOT NULL AUTO_INCREMENT,
`usename` varchar(32) NOT NULL,
`password` varchar(32) NOT NULL,
`name` varchar(50) NOT NULL,
PRIMARY KEY (`admin_id`)
) ENGINE=InnoDB ;
 Create table employee
CREATE TABLE `employee` (
`employee_id` varchar(10) not null,
`name` varchar(32) NOT NULL,
`usename` varchar(50) not null ,
`password` varchar(32) NOT NULL,
`phone` varchar(15) NOT NULL,
`address` varchar(50) not null,
PRIMARY KEY (`employee_id`)
) ENGINE=InnoDB ;
 Create table customer
CREATE TABLE `customer` (
`customer_id` varchar(10) not null,
`name` varchar(32) NOT NULL,
`phone` varchar(15) NOT NULL,
`address` varchar(50) not null,.+
PRIMARY KEY (`customer_id`)
) ENGINE=InnoDB ;
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 Create table product
CREATE TABLE `product` (
`product_id` varchar(10) not null,
`name` varchar(32) NOT NULL,
`price` decimal(9,2) not null ,
`image` text default null ,
PRIMARY KEY (`product_id`)
) ENGINE=InnoDB ;
 Create table transanction
CREATE TABLE `transanction` (
`transaction_id` varchar(10) not null,
`employee_id` varchar(32) NOT NULL,
`product_id` varchar(10) not null ,
`date_invoice` date NOT NULL,
`date_receipt` date NOT NULL,
`amount` decimal(15,2) not null ,
`payment` varchar(32),
PRIMARY KEY (`transaction_id`)
) ENGINE=InnoDB ;
 Create table order
CREATE TABLE `order` (
`order_id` varchar(10) not null,
`customer_id` varchar(32) NOT NULL,
`address` varchar(50) not null ,
`phone` varchar(10) NOT NULL,
`note` varchar(50) default NULL,
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PRIMARY KEY (`order_id`)
) ENGINE=InnoDB ;
 Create table order_detail
create table `order_detail`(
`order_detail_id` varchar(10) not null ,
`product_id` varchar(10) not null,
`order_id` varchar(10) not null,
`price` decimal(9,2) not null,
`quantity` int not null,
primary key (order_detail_id)
) engine=innoDB;
2.Database Diagram:
P3 Implement a query language into a relational database systemSelect

Insert normally:
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Table customer
Table employee
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Table order
Table order_detail
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Select with employee and transanction:
Run project
a. Insert
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Add data to admin table
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Add data to employee table

Update
Edit data in product table
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Before
editing
After editing

Delete
delete data in employee table
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before deleting
after deleting
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M2 Implement a fully functional database system including system security and database
maintenance.
a. Trigger
The trigger (from the Dutch trekken, meaning pull) is a lever that, when pulled with a finger,
releases the hammer on the gun. In a database, a trigger is a set of Structured Query
Language (SQL) statements that automatically "trigger" an action when a specific operation,
such as a change in data in the database, occurs. table, happens.
What is the function of the trigger?
Generating a response to an event is performed using a trigger. A trigger is a statement that
you are interested in a certain event or set of events. Binding a function to a trigger allows
you to capture and act on events.
MySQL Triggers are a database object in MySQL associated with a table. When an INSERT,
UPDATE, DELETE event occurs in the database table, the Trigger will be fired and execute
a task you want. Triggers can be fired before and after the event is fired.
Create another table to save the change history
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 Create trigger for each event add, remove, edit, dele
Try with insert statement
 Result
b. Create a user with access to only one database with a Graphical User Interface (GUI)
Step 1
At your browser type ” http://localhost/phpMyAdmin ”
Step 2
Navigate to the Users Tab and Click ” Add User ”
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Ad
d New User at MySql
Step 3
Populate New User Credentials at the (Login Information Only)
(1) UserName
(2) Password
(3) Server ( this example is localhost )
Note : Do not global privilege , and check all , this will grant the User Access to all your
Database in the Systems
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populate new user username and password
Step 4
Check whether your New User is being created
In this Example
New User Name : david Password :david
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Check New User created
Step 5
At the User List . Click the New User that you have just Created
In this Example is David
then
(1) at ” Privilege to the following database” select the Database that you want your new User
to access. In this Example is mydata Data Base
(2) Then Click ” go ”
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Select Which Database the New User can Access
Step 6
Grant the new User , privilege , fields that he or she can access to your specific data base
In this Case I grant all Privilege to David on mydata Database
Grant the User Privellege what he can do with the Database
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Step 7
After you grant access and privileges of the specific Database to your new User . Double check
whether the Setting is being Configure
(1) go to Database
(2) Select your Specific Database, in this case for me is mydata Database
(3) click Privelleges
(4) Check whether your new User have access to this Data base
Check New User Access Right to the Specific DatabaseM3. Assess whether meaningful data has
been extracted through the use of query tools to generate appropriate management information
display tables in a database
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display tables when editing information
display errors during data extraction
can display requests that have been made requests that have been passed after displaying the
tables
The process runs very quickly and needs some more accuracy requirements in the process of
importing and exporting data and connecting between tables.
LO3 System testing according to user and system requirements
P4 Check User and System Requirements
Test
What is being
tested
TC1
Add new product
Test
data
How
Enter data from Set 1
data capture
sheet into insert
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Expected
Result
The product
was stored
into the
Actual
results
Action
taken
Ok
None
database
TC2
Show list of
products
Select all
products in the
Products table
with query
Select
Set 2
Show all
values
Products
Ok
None
TC3
Update ID_mf
Update the
ID_mf =
“MF001”with
id_prd is
“PRD004”
Set 3
Ok
Update
ID_mf
“MF002” to
“MF001”
None
TC4
Delete ID_prd =
“PRD008”
Delete the
product with id
“PRD008”
Set 4
Ok
Delete
Product with
id
“PRD008”
None
TC5
Show ID_prd,
Quantity, ID_wh of
Product having
Quantity >=250
Use the query
Set 5
Select to show
ID_prd,
Quantity,
ID_wh of
Product having
Quantity >=250
The result
will show
ID_prd,
Quantity,
ID_wh wh
of Product
having
Quantity
>=250
Ok
None
TC6
add a new product Enter data from Set 6
data capture
to the
ProductManagemen sheet into insert
t table having
Quantity of product
<0
Data cannot
store
because
statement
Ok
None
Ok
None
conflicted
with the
CHECK
constraint
TC7
Check foreign key Enter the
ID_prd that is
constraint of
ProductManagemen not in the
0
Set 7
Data cannot
store
because
0
t table to Products
table
Products table
into the
ProductManage
ment table
conflicted
with the
FOREIGN
KEY
constraint
"FK_id_prd"
M4 Evaluation of the effectiveness of the trial, including an explanation of the selection of test
data used
requirements can be expressed
Fast operation and high accuracy
D2 performance of the database solution regarding user and system requirements, and
recommending improvements

Assign access rights
Decentralization is the delegation of authority for a member to do and not to do in the software.
Deeply decentralized software will allow managers to strike a balance between making it easy
for employees to collaborate, while also protecting company data. For example, if you're
working on a project with highly sensitive data, you need the project team to have enough
permissions to collaborate, but you also want to maintain moderate information access. enough
for each member.
The decentralization feature in Base's software is intensively researched and developed, with the
desire to help administrators achieve this balance.

User identification;
MySQL uses a different authentication protocol for server access and identity than SQL Server
and Oracle. The identity of the MySQL user is checked using three pieces of information:
Hostname; MySQL Username and MySQL Access Password.
In order to access the database, the identifier must match the certificates stored in the database,
the login name is completely separate from the operating system login account, and there is also
no relationship between the password. MySQL password with the operating system password.
The hostname may show up as an IP address and may not need to be provided if it is a server
running MySQL. There are three components stored in the users table: host, user, and password.
Connections are allowed only when those three values match.

Information encryption and data compression;
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Information encryption is the transformation of data into another form of data with a different
meaning than the data before the original transformation, for the purpose of allowing the data to
be readable by some people. Initially, through the decoding of the data after the conversion. In
other words, encryption is turning the original data A into data B, and reading data A will be
through the decryption of data B about A.
Data compression is a change in data structure, the purpose is to reduce storage capacity,
contribute to increase data security.
When there is compressed data, it is necessary to understand the compression rules to be able to
decompress and restore the original data.

Policy and consciousness;
Security can be accomplished by both hardware and software engineering solutions. However,
the security still depends on the guidelines and policies of the information owner and the user's
consciousness
The person analyzing, designing and creating the database must have a good solution of the right
hardware and software
Users must be aware of information protection

recordkeeping.
In addition to the above solutions, people also organize to save system minutes
The system log usually says
- number of visits to the system
- information about the number of last login attempts
System records significantly support system recovery in the event of a technical problem and
provide information that allows users to assess the level of user interest in the system in general
and each component of the system. in particular
there are many elements of the protection system that can change during database mining
In order to improve security efficiency, the system's parameters must be changed regularly
It should be noted that both hardware and software solutions do not guarantee absolute safety of
the system
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LO4. Production of technical and user documentation
P5 .Producing technical and user documentation
 Delete Database in SQL Server
 Right-click on the Database to be deleted in the Databases list on the left > Delete
The Delete Object window displays. Please check the box Close existing connections > OK to be
sure to delete it.
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 In the query, write a statement with the following syntax. Highlight > Excute (Shortcut
F5)
 Some notes in SQL
 Database already exists
During the process of creating Database using UI, if you encounter the following error, it means
that the Database name you want to initialize is the same as the Database name already available
in SQL Server.
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 Did not find the newly created database or still see the deleted database in the list
In some cases, you may not see the newly created Database, or still see the name of the deleted
Database in the list of Databases on the left after successfully executing the command.
You right click on Databases > Refresh to update the Database list
 Execute command in Query
During the execution of the command (Excute) in the Query:
When you highlight a command line, only that command line is executed.
If you do not highlight the command line to be executed but press Excute (F5), all commands in
that query will be executed. What is easy to cause data duplication error, or cannot execute the
command, the command is faulty, ...
 Save the query containing the command
The query is saved as a regular file. Select Save or the keyboard shortcut Ctrl + WILL
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Select the location to save the Query in the red frame > enter the Query name in File name or
save it under the default name > Save
M5. Create technical and user documentation for a fully functional system, including
diagrams that show the movement of data through the system and flowcharts that describe how
the system works
https://www.gleek.io/blog/best-erd-tools.html
https://vietnix.vn/he-quan-tri-co-so-du-lieu/
https://viblo.asia/p/tong-hop-ve-chuan-hoa-co-so-du-lieu-ORNZqP33K0n
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