consider the following set of requirements for a database that is used to keep track information about a university

Create table statement:CREATE TABLE ProfessorsPSSN varchar20 CHECKPSSN like ''''P%'''',Name nvarchar50,Age int CHECKAge >= 22,Ranking int CHECKRanking > 0,Research nvarchar50 CHECKResearch = ''''

Database Systems - DBI202

Teacher: VU THANH PHONG

Table of contents: Page ASSIGNMENT REPORT

TOPIC ……….3

I Introduction to the problem ……….……3

1 Describe the problem ……….3

2 Management goals ……… 4

II Entity Relationship Model ……….4

1 Identify entity sets, attributes ……….4

2 Make E/R diagram ………5

III Data Requirements Specification ……… 6

1 Relational model ………6

2 Database Diagram ………15

3 Trigger – Procedure – SQL Query ………16

TOPIC 3 Consider the following set of requirements for a database that is used to keep track information about a university.

I Introduction to the problem (write the user requirement).

1 Describe the problem.

A university has a need to build a database to manage professors and manage projects done by students:

- Professors have an SSN, a name, an age, a rank, and

a research specialty Projects have a project number, a sponsor name (e.g., NSF), a starting date, an ending date, and a budget Graduate students have an SSN, a name, an age, and a degree program (e.g., M.S or Ph.D.)

- Each project is managed by one professor (known as the project’s principal investigator) Each project is worked on by one or more professors (known as the project’s co-investigators) Professors can manage and/or work on multiple projects Each project is worked

on by one or more graduate students (known as the project’s research assistants)

- When graduate students work on a project, a

professor must supervise their work on the project Graduate students can work on multiple projects

- Departments have a department number, a department name, and a main office Departments have a professor (known as the chairman) who runs the department Professors work in one or more departments

- Graduate students have one major department in whichthey are working on their degree

- Each graduate student has another, more senior graduate student who advises him or her on what courses

to take Design and draw an ER diagram that captures theinformation about the university Use only the basic ER model here; that is, entities, relationships, and attributes Be sure to indicate any key and

II Entity Relationship Model (E/R model).

1 Identify entity sets, attributes.

- Based on the description of the problem and the management goal, we can give some entities and the properties of that entity as follows:

Professors: ID, Name, Age, Ranking, Research Departments: ID, Name, Office.

Students: ID, Name, Age, Degree.

Projects: ID, Name, StartingDate, EndingDate,

Budget

- Relation between entity:

+ Professors run Department

+ Professors work in Department

+ Professors manage Project

+ Professors work on Project

+ Professors supervise Project, Student

+ Students work on Projects

+ Students major Department

+ Senior Graduate introduce Graduate Students

2 Make E/R diagram.

III Data Requirements Specification (Data dictionary).

1 Relational model (Converted from E/R model).

Create table statement:

CREATE TABLE Professors(

PSSN varchar(20) CHECK(PSSN like 'P%'),

Name nvarchar(50),

Age int CHECK(Age >= 22),

Ranking int CHECK(Ranking > 0),

Research nvarchar(50) CHECK(Research = 'Master' or Research = 'Doctor'),

) StartingDate Date

EndingDate Date

Budget Float 0 Budget >= 0

PR05 P05 Elementary Japanese 2022-10-01 2022-11-01 0

Create table statement:

CREATE TABLE Projects(

ProjectNumber varchar(20) CHECK(ProjectNumber like 'PR

Budget float CHECK(Budget >= 0) DEFAULT 0,

Primary key (ProjectNumber),

FOREIGN KEY (PSSN) REFERENCES Professors(PSSN)

)

Create table statement:

CREATE TABLE Departments (

DNumber int CHECK(DNumber > 0),

PSSN varchar(20) CHECK(PSSN like 'P%'),

DName nvarchar(50),

Office nvarchar(50),

Primary key (DNumber),

FOREIGN KEY (PSSN) REFERENCES Professors(PSSN)

)

d TABLE STUDENTS

Attribute

s Data type Default Check Key/Index/Constrains

FOREIGN KEY (DNumber) REFERENCES Departments(DNumber) Name Nvarchar(50)

Create table statement:

CREATE TABLE Students (

SSN varchar(20) CHECK(SSN like 'SE%'),

SupSSN varchar(20) CHECK(SupSSN like 'SE%'),

DNumber int CHECK(DNumber > 0),

) SSN Varchar(20

Example:

PR02 SE160369

Create table statement:

CREATE TABLE WorkOnPRJS (

ProjectNumber varchar(20) CHECK(ProjectNumber like 'PR

%'),

SSN varchar(20) CHECK(SSN like 'SE%'),

Primary key (SSN, ProjectNumber),

FOREIGN KEY (ProjectNumber) REFERENCES

r

Varchar(20 )

ProjectNumbe

r like 'PR%'

Primary Key, FOREIGN KEY (ProjectNumber) REFERENCES Projects(ProjectNumb er)

Example:

P02 PR02

Create table statement:

CREATE TABLE WorkOnPROS (

PSSN varchar(20) CHECK(PSSN like 'P%'),

ProjectNumber varchar(20) CHECK(ProjectNumber like 'PR%'),Primary key (PSSN, ProjectNumber),

FOREIGN KEY (PSSN) REFERENCES Professors(PSSN),

FOREIGN KEY (ProjectNumber) REFERENCES

) SSN Varchar(20

Example:

Create table statement:

CREATE TABLE Supervise (

PSSN varchar(20) CHECK(PSSN like 'P%'),

ProjectNumber varchar(20) CHECK(ProjectNumber like 'PR%'),SSN varchar(20) CHECK(SSN like 'SE%'),

Primary key (PSSN, SSN, ProjectNumber),

FOREIGN KEY (PSSN) REFERENCES Professors(PSSN),

FOREIGN KEY (ProjectNumber) REFERENCES

Primary Key, FOREIGN KEY (DNumber) REFERENCES Departments(DNumber)

Example:

Create table statement:

CREATE TABLE WorkIn (

PSSN varchar(20) CHECK(PSSN like 'P%'),

DNumber int CHECK(DNumber > 0),

Hourss int CHECK(Hourss >= 0) DEFAULT 0,

Primary key (PSSN, DNumber),

FOREIGN KEY (PSSN) REFERENCES Professors(PSSN),

FOREIGN KEY (DNumber) REFERENCES Departments(DNumber))

2 Database diagram

3 Trigger – Procedure – SQL Query

b Display the number of professor that is working in each department.

Query Statement:

SELECT DNumber, DName, COUNT( P PSSN) AS NumOfProfessor

FROM Departments D INNER JOIN WorkIn WI ON DNumber

WI DNumber

INNER JOIN Professors P ON WI.PSSN = P PSSN

GROUP BY DNumber, DName

c Display all students that doesn’t have supervise student Query Statement:

SELECT SSN, DNumber, Name, Age, Degree

FROM Students

WHERE SupSSN is null

2 TRIGGER

a Trigger for insert on Projects table

Usage: If the row that user insert into Projects table has

Ending Date that not after the Starting Date The trigger will print the notification and rollback for avoiding this insert Otherwise, the row that user insert will be inserted normally

Create Trigger Statement:

CREATE TRIGGER startDate_endDate_check on Projects

SELECT @SDATE = StartingDate , @EDATE = EndingDate

FROM INSERTED

DECLARE @SYEAR INT , @SMONTH INT , @SDAY INT

SELECT @SYEAR = YEAR( @SDATE ), @SMONTH = MONTH( @SDATE ), @SDAY

DAY( @SDATE )

DECLARE @EYEAR INT , @EMONTH INT , @EDAY INT

SELECT @EYEAR = YEAR( @EDATE ), @EMONTH = MONTH( @EDATE ), @EDAY

b Trigger for insert on Students table

Usage: If the row that user insert into Students table has

Supervise Student that has degree is not Senior Graduate The trigger will print the notification and rollback for avoiding

this insert Otherwise, the row that user insert will be inserted normally.

Create Trigger Statement:

CREATE TRIGGER SUP_STU_TRIG ON STUDENTS

FOR INSERT

AS

BEGIN

DECLARE @SUP_SSN VARCHAR ( 20 )

SELECT @SUP_SSN = SupSSN

FROM STUDENTS

DECLARE @SUP_DEGREE NVARCHAR ( 30 )

SELECT @SUP_DEGREE = DEGREE

c Trigger for insert on WorkIn table

Usage: The professor that manage the department need to have

the highest ranking (Rank 1 > Rank 2) in department If the row that user insert into WorkIn table has professor has higher ranking than department's manager The trigger will print the notification and rollback for avoiding this insert.Otherwise, the row that user insert will be inserted

normally

Create Trigger Statement:

CREATE TRIGGER check_WorkIn ON WORKIN

FOR INSERT

AS

BEGIN

DECLARE @DNUM INT , @IPSSN VARCHAR ( 20 )

SELECT @DNUM = DNUMBER , @IPSSN = PSSN

FROM INSERTED

DECLARE @ManagerNum VARCHAR ( 20 )

SELECT @ManagerNum = PSSN

FROM DEPARTMENTS

WHERE DNumber = @DNUM

DECLARE @IRANKING INT

SELECT @IRANKING = Ranking

FROM Professors

WHERE PSSN = @IPSSN

DECLARE @ManagerRanking INT

SELECT @ManagerRanking = Ranking

Usage: Normally, if user want to delete a Project they need

to delete in all table that referenced to Projects table Therefore, we create this procedure that help user can delete

a project by the Project Number in one statement

Create procedure statement:

CREATE PROCEDURE DELETE_PRO_BY_KEY @PRONUM varchar ( 20 )

AS

BEGIN

DELETE FROM WorkOnPROS

WHERE ProjectNumber = @PRONUM

DELETE FROM Supervise

WHERE ProjectNumber = @PRONUM

DELETE FROM WorkOnPRJS

WHERE ProjectNumber = @PRONUM

DELETE FROM Projects

WHERE ProjectNumber = @PRONUM

END

GO

b Procedure that helping user Insert a project into the Projects table

Usage: Normally, if user want to insert a Project they need

to insert the professor if PSSN not exist in the Professor table Therefore, we create this procedure that help user caninsert a project into Projects table in one statement At thesame time, we put the insert statement in TRANSACTION and in block TRY so if any error happen the insert will not be inserted to table for avoiding wrong data in database

Create procedure statement:

CREATE PROCEDURE INSERT_PRO

SET NOCOUNT ON

BEGIN TRAN

BEGIN TRY

DECLARE @CHECK INT

SELECT @CHECK = COUNT( PSSN ) FROM Professors

GROUP BY PSSN

HAVING PSSN = @PSSN

IF ( @CHECK is not null) BEGIN

INSERT INTO Projects

VALUES ( @projNum , @PSSN , @projName , @startDate ,

@endDate , 0 )

END ELSE BEGIN INSERT INTO Professors

VALUES ( @PSSN , @profName , @profAge , @ranking ,

@research )

INSERT INTO Projects

VALUES ( @projNum , @PSSN , @projName , @startDate , @endDate , 0 )