MySQL

1. About MySQL
•MySQL is relational database management
system (RDBMS).
•MySQL is Open Source (Free License).
•A database is a collection of data organized
for the purpose of "sharing and using
multiple" and "searching and processing"
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2. Create Database (by root user)
$ mysql -u root -p
Enter password: # input password
mysql> create database college; # create DB
mysql> show databases;
3
Database
information_schema
college
mysql
performance_schema
sys
wordpress

3. Create User (by root user)
# Create a test user and give all privileges to the corresponding DB
mysql> grant all on college.* to test@localhost identified by 'test';
mysql> select user from mysql.user; # Confirm that test user was added
mysql> exit
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user
debian-sys-maint
mysql.session
mysql.sys
root
test
wordpress

4. Login by working user
$ mysql -u test -p
Enter password: # input passwrd
mysql> show databases; # Confirm DB available for working users
mysql> use college; # Set the DB to use
5
Database
information_schema
college

5a. Create Table
mysql> create table tbl_name
(col_name1 data_type1,
col_name2 data_type2, ...);
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5b. Create Table
mysql> create table staff_register(
id int(4) auto_increment primary key,
department varchar(32) not null,
section varchar(32) not null,
name varchar(32) not null,
phone int(8),
email varchar(32)
);
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6. Show Table
# Confirm to create table
mysql> show tables;
8
Tables in college
staff_register

7. Description Table
mysql> desc staff_register; # Show column
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Field Type Null Key Default Extra
id int(4) NO PRI NULL auto_increment
department varchar(32) NO NULL
section varchar(32) NO NULL
name varchar(32) NO NULL
phone int(8) YES NULL
email varchar(32) YES NULL

8. Add Record
mysql> insert into staff_register (id, department, section,
name, phone, email) values (1, 'Technology', 'Applied Science',
'John Brawn', 74111111, 'aaa@gmail.com');
# The description of the column can be omitted only when
specifying values for all columns
mysql> insert into staff_register values (1, 'Technology',
'Applied Science', 'John Brawn', 74111111, 'aaa@gmail.com');
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9. Update Record
mysql> select * from staff_register; # Comfirm add record
# Changed John Brawn's name to Jack Brawn
mysql> update staff_register set name = 'Jack Brawn' where name =
'John Brawn';
mysql> select * from staff_register; # Comfirm updated record
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id department section name phone email
1 Technology Applied Science John Brawn 74111111 aaa@gmail.com
1 Technology Applied Science Jack Brawn 74111111 aaa@gmail.com

10. Add some record
mysql> insert into staff_register (department, section, name, phone, email)
values ('Technology', 'ICT', 'Jacob', 74111112, 'bbb@gmail.com');
mysql> insert into staff_register (department, section, name, phone) values
('Technology', 'ICT Support', 'Jackson', 74111113);
mysql> insert into staff_register (department, section, name, email) values
('Administration', 'Administration', 'Noah', 'ddd@gmail.com');
mysql> insert into staff_register (department, section, name) values
('Administration', 'Finance', 'Lucas');
mysql> insert into staff_register (department, section, name) values
('Administration', 'Learning Resouces Centre', 'Sophia');
('Administration', 'Maintenance', 'Chloe', 'fff@yahoo.com');
('Administration', 'Supplies & Contracts', 'George', 'ggg@yahoo.com');
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11. Comfirm Record
mysql> select * from staff_register;
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2 Technology ICT Jacob 74111112 bbb@gmail.com
3 Technology ICT Support Jackson 74111113 NULL
4 Administration Administration Noah NULL ddd@gmail.com
5 Administration Finance Lucas NULL NULL
6 Administration Learning Resouces Centre Sophia NULL NULL
7 Administration Maintenance Chloe NULL fff@yahoo.com
8 Administration Supplies & Contracts George NULL ggg@yahoo.com

12. Exercise
1. add a record containing your name
to staff_register table.
2. Comfirm added record
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13. Delete Record
mysql> delete from staff_register where section = 'Finance';
mysql> select * from staff_register; # comfirm deleted record
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2 Technology ICT Jacob 74111112 bbb@gmail.com
3 Technology ICT Support Jackson 74111113 NULL

14. Extraction Conditions
# You can specify the extraction condition in the where clause.
mysql> select * from staff_register where department = "Administration";
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15. LIKE Operator
# You can also use the LIKE operator and the wildcard character "%"
to specify a partial match condition for a string.
mysql> select * from staff_register where email like '%yahoo.com';
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16. Delete Table
mysql> truncate table staff_register; # Delete data in staff_register table
mysql> select * from staff_register; # Comfirm deleted record
mysql> drop table staff_register; # Delete staff_register table
mysql> show tables; # Comfirm deleted table
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17. Delete User (by root user)
$ mysql -u root -p
Enter password: # input password
# deprive access authority to all databases from the test user
mysql> revoke all privileges on *.* from test@localhost;
mysql> drop user test@localhost; # delete test user
mysql> select user from mysql.user; # comfirm deleted test user
mysql> flush privileges; # Reflect test user deletion on MySQL server
mysql> exit
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MySQL

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