SQL Server 2008Lecture 2Hazem TorabCEO, Founder Enozom Software

Agenda• Student & Courses Example

• Creating Database Tables

• Data Types

• Transact SQL Statements– DML

Students & Courses Example• Problem Statement

A training center that teaches training courses for students is asking you to make a database for them.

Every student can register for one or more course, the courses are usually opened once every a month. For example “Windows 7” course is available on 1/1/2013 and 1/2/2013.

Some course can’t be registered for a student without passing other courses for example for “SQL Server” course student must pass “Windows 7” & “Database” courses

Write Down Your Design

Creating Database Tables• Before you start, disable the prevention of saving changes

that require table re-creation from Tools->options->Designers-> tables and database diagrams

Creating Database Tables• Right click on tables in your database

• Type your column names

Creating Database Tables• Set Your Primary Key

• Choose the suitable Data Type

Creating Database Tables• Create Relations

Creating Database Tables• Create Relations

Complete Design

SQL Server Data Types• Main Data Types

– Int– DateTime– Decimal– Money– Float– Varchar– Nvarchar– XML– Bit– Text

• http://www.connectionstrings.com/Articles/Show/sql-server-data-type-reference

Transact SQL – Data Manipulation Language• Select

Select CourseID, CourseName from Course

• Insert

Insert into Course (CourseName) values (‘Windows’)

• Update

Update Course Set Course= ‘Windows 7’ where CourseID = 1

• Delete

Delete Course where CourseID = 1

SQL Operators• Mathematical Operators

SELECT 15 + 4, --Addition 15 - 4, --Subtraction 15 * 4, --Multiplication 15 / 5, -- Division 15 % 4; --Modulus

SQL Operators• Equality Operators

Operator Example Defined Result

=, IS 5 = 5 5 equal to 5? True

!=, IS NOT 7 != 2 7 IS NOT (!=) equal to 2? True

< 7 < 4 7 less than 4? False

> 7 > 4 greater than 4? True

<= 7 <= 11 Is 7 less than or equal to 11? True

>= 7 >= 11Is 7 greater than or equal to 11?

False

Like ‘enozom’ like ‘%e%’

Contains the character ‘e’ True

Joins• Inner Join

Get students with their citiesSelect StudentFirstName, CityName from student inner join city on studenet.CityID= City.CityID

• Left joinGet All students with their cities and if it has no cities enteredSelect StudentFirstName, CityName from student left outer join city on studenet.CityID= City.CityID

Joins• Right Join

Get All cities whether it has no students Select StudentFirstName, CityName from student right outer join city on studenet.CityID= City.CityID

• Cross Join Get All cities whether it has no students and all student whether it has no city Select StudentFirstName, CityName from student right outer join city on studenet.CityID= City.CityID

Using Query Editor for Complex Queries

Using Query Editor

Select Tables and Filters

Aggregate Functions• Sum

• Count

• Max

• Min

• AVG

• Gets the count of all students

Select Count (*) from student

Grouping

• Gets the count of student in each city

Select CityName, Count(*) from student inner join city on

student.cityid = city.cityid

Group by CityName

Sorting

• Select StudentFirstname, StudentMiddleName,

StudentLastName from student order by StudentFirstname,

StudentMiddleName, StudentLastName ASC

Exercise• Get list of student registered in specific course

• Get Number of student registered in each group for course ‘Windows 7’

• Get number of student in each city while their firstname starts with ‘A’

• Get the total fees that spent for each student

• Get the collected money for each course

Thank YouHazem Torab

Hazem.torab@enozom.com

http://www.enozom.com

https://www.facebook.com/Enozom