-- Create Marks
create table Marks (
	roll_number nvarchar(20),
	marks float
)

-- Chen du lieu -> Insert Data
insert into Marks(roll_number, marks)
values
('R001', 60)

insert into Marks(roll_number, marks)
values
('R002', 50),
('R003', 90)

-- Xem du lieu
select * from Student
select * from Marks

select student_name from Student

select student_name 'Ten Sinh Vien' from Student

select roll_number 'MaSV', student_name as 'TenSV' from Student
select * from Marks

select * from Student

insert into Student(roll_number, student_name)
values
('R001', 'TRAN VAN A')

delete from Student
drop table Student

create table Student (
	roll_number nvarchar(20) primary key,
	student_name nvarchar(50)
)

-- Them column: email, address, phone
alter table Student
add email nvarchar(150)

alter table Student
add address nvarchar(150)

alter table Student
add phone nvarchar(20)

alter table Student
alter column phone int

alter table Student
alter column phone nvarchar(20)

alter table Student
add abc nvarchar(50)

-- Xoa di
alter table Student
drop column abc

insert into Student(roll_number, student_name, email, address, phone)
values
('R002', 'TRAN VAN A', 'a@gmail.com', 'Ha Noi', '123456789')

select * from Student

select * from Marks
drop table Marks

create table Subject (
	subject_id int primary key identity(1,1),
	subject_name nvarchar(50)
)

insert into Subject (subject_name)
values
('Lap Trinh C'),
('Lap Trinh HTML/CSS/JS')

select * from Subject

delete from Subject

drop table Marks

create table Marks (
	subject_id int,
	roll_number nvarchar(20),
	marks float,
	primary key (subject_id, roll_number)
)

insert into Marks(subject_id, roll_number, marks)
values
(3, 'R001', 6),
(4, 'R001', 8)

select * from Marks
select * from Student
select * from Subject

-- Create Marks
create table Marks (
	roll_number nvarchar(20),
	marks float
)

-- Chen du lieu -> Insert Data
insert into Marks(roll_number, marks)
values
('R001', 60)

insert into Marks(roll_number, marks)
values
('R002', 50),
('R003', 90)

-- Xem du lieu
select * from Student
select * from Marks

select student_name from Student

select student_name 'Ten Sinh Vien' from Student

select roll_number 'MaSV', student_name as 'TenSV' from Student
select * from Marks

Nội dung:
	- SQL
		- SQL Server => Su dung trong giang day.
		- MySQL
		- Oracle
		...
	- Backend: PHP -> doc noi dung SQL -> sinh ra code html/css/js (fill data)
	- SQL Server là gì?
	- Tại sao chúng ta lại học môn này?
	- Cài đặt môi trường phát triển
	- Cấu trúc dữ liệu trong SQL Server
	- Một số lệnh cơ bản trong SQL Server
		- Create database
			- Tools
			- Dùng lệnh
		- Create tables
			- Tools
			- Dùng lệnh
		- Insert dữ liệu
			- Tools
			- Dùng lệnh
		- Select (Xem dữ liệu)
			- Căn bản.
------
Khai niem:
	- database -> CSDL -> noi de luu tru tat tables
	- Table -> bang: sinh vien
	- Column -> cot
	- record -> ban ghi
	- primary key

Cai dat moi truong phat trien SQL Server
	- SQL Express: https://www.microsoft.com/en-us/sql-server/sql-server-downloads
	- SQL Server Management Studio: https://docs.microsoft.com/en-us/sql/ssms/download-sql-server-management-studio-ssms?view=sql-server-ver15