the student database student sidnameaddragegpa 301john183 westwood192.1 303elaine301 wilshire173.9...

The Student Database

Student

sid name addr age GPA

301 John 183 Westwood 19 2.1

303 Elaine 301 Wilshire 17 3.9

401 James 183 Westwood 17 3.6

208 Esther 421 Gayley 20 3.1

Class

dept cnum sec title instructor

CS 143 01 DB Systems John Cho

CS 112 01 Modeling Dick Muntz

EE 301 01 Signal James Dean

EE 183 01 Mechanics Dick Muntz

Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

GradStudent


501 Raymond 180 Westwood 23 3.9

502 Amy 301 Wilshire 35 3.4

503 Jack 220 Gayley 22 3.5

504 Dan 220 Gayley 25 3.3

The Selection Operator Give me information of students under the age of 18

age<18(Student)









The Projection Operator Give me the name, address, and GPA of all the

students name, addr, GPA(Student)

name, GPA, addr(Student)






name addr GPA

John 183 Westwood 2.1

Elaine 301 Wilshire 3.9

James 183 Westwood 3.6

Esther 421 Gayley 3.1

name GPA addr

John 2.1 183 Westwood

Elaine 3.9 301 Wilshire

James 3.6 183 Westwood

Esther 3.1 421 Gayley

Sample Query Give me the SID and GPA for students under the

age of 18 sid, GPA(age<18(Student))









sid GPA

303 3.9

401 3.6

The Cross Product Operator Give me all combinations of students and the

enrollment of students Student Enroll = (Student.sid, name, addr, age, GPA,

Enroll.sid, dept, cnum, sec) Student.sid name addr age GPA Enroll.sid dept cnum sec

301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01

303 Elaine 301 Wilshire 17 3.9 301 CS 143 01

303 Elaine 301 Wilshire 17 3.9 301 EE 301 01



401 James 183 Westwood 17 3.6 301 CS 143 01

401 James 183 Westwood 17 3.6 301 EE 301 01



208 Esther 421 Gayley 20 3.1 301 CS 143 01

208 Esther 421 Gayley 20 3.1 301 EE 301 01

208 Esther 421 Gayley 20 3.1 303 CS 112 01

208 Esther 421 Gayley 20 3.1 401 EE 183 01

Student.sid name addr age GPA Enroll.sid dept cnum sec

301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01


301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01






301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01









Student






Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

Selecting on Cross Products Give me all the information of enrolled students

Student.sid = Enroll.sid(Student Enroll)


301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01




301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01









208 Esther 421 Gayley 20 3.1 301 CS 143 01

208 Esther 421 Gayley 20 3.1 301 EE 301 01

208 Esther 421 Gayley 20 3.1 303 CS 112 01

208 Esther 421 Gayley 20 3.1 401 EE 183 01

Student






Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

Sample Query Give me the name and addresses of students taking

CS courses whose GPA is below 3.0 name, addr(dept = ‘CS’ GPA < 3.0 Student.sid = Enroll.sid(Student Enroll))


301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01

301 John 183 Westwood 19 2.1 303 CS 112 01

301 John 183 Westwood 19 2.1 401 EE 183 01









208 Esther 421 Gayley 20 3.1 301 CS 143 01

208 Esther 421 Gayley 20 3.1 301 EE 301 01

208 Esther 421 Gayley 20 3.1 303 CS 112 01

208 Esther 421 Gayley 20 3.1 401 EE 183 01


301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01




301 John 183 Westwood 19 2.1 301 CS 143 01

301 John 183 Westwood 19 2.1 301 EE 301 01


301 John 183 Westwood 19 2.1 301 CS 143 01

name addr

John 183 Westwood

Student






Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

The Join Operator Class Enroll

Class.dept = Enroll.dept Class.cnum = Enroll.cnum Class.sec = Enroll.sec(Class Enroll)

Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

Class






C.dept C.cnum C.sec title instructor sid E.dept Elcnum E.sec

CS 143 01 DB Systems John Cho 301 CS 143 01

CS 143 01 DB Systems John Cho 301 EE 301 01



CS 112 01 Modeling Dick Muntz 301 CS 143 01

CS 112 01 Modeling Dick Muntz 301 EE 301 01



EE 301 01 Signal James Dean 301 CS 143 01

EE 301 01 Signal James Dean 301 EE 301 01



EE 183 01 Mechanics Dick Muntz 301 CS 143 01

EE 183 01 Mechanics Dick Muntz 301 EE 301 01



C.dept C.cnum C.sec title instructor sid E.dept E.cnum E.sec





The Theta-Join Operator

Class Class.cnum = Enroll.cnum Enroll.dept = ‘CS’ Enroll

Class.cnum = Enroll.cnum Enroll.dept = ‘CS’(Student Enroll)

Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

Class


























The Union Operator Give me the SIDs of all students

sid(Student GradStudent)

Student






GradStudent




503 Jack 220 Gayley 22 3.5

504 Dan 220 Gayley 25 3.3








503 Jack 220 Gayley 22 3.5

504 Dan 220 Gayley 25 3.3

sid

301

303

401

208

501

502

503

504

The Set-Difference Operator – Give me the department, course number, and

section of all classes without any enrolled students dept, cnum, sec(Class) – dept, cnum, sec(Enroll)

Class






Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

dept cnum sec

CS 143 01

CS 112 01

EE 301 01

EE 183 01

dept cnum sec

CS 143 01

EE 301 01

CS 112 01

EE 183 01

dept cnum sec

The Set-Intersection Operator Give all the instructors who teaches both CS and EE

classes instructor(dept=’CS’(Class)) instructor(dept=’EE’(Class))

Class
















instructor

John Cho

Dick Muntz

instructor

James Dean

Dick Muntz

instructor

Dick Muntz

The Rename Operator Give me pairs of student names who live at the

same address R.name > S.name(name, name(R.addr = S.addr(R(Student) S(Student) )

) ) Student






R.sid R.name R.Addr R.Age R.GPA S.Sid S.Name S.Addr S.Age S.GPA

301 John 183 Westwood 19 2.1 301 John 183 Westwood 19 2.1

301 John 183 Westwood 19 2.1 303 Elaine 301 Wilshire 17 3.9

301 John 183 Westwood 19 2.1 401 James 183 Westwood 17 3.6

301 John 183 Westwood 19 2.1 208 Esther 421 Gayley 20 3.1

303 Elaine 301 Wilshire 17 3.9 301 John 183 Westwood 19 2.1

303 Elaine 301 Wilshire 17 3.9 303 Elaine 301 Wilshire 17 3.9

303 Elaine 301 Wilshire 17 3.9 401 James 183 Westwood 17 3.6

303 Elaine 301 Wilshire 17 3.9 208 Esther 421 Gayley 20 3.1

401 James 183 Westwood 17 3.6 301 John 183 Westwood 19 2.1

401 James 183 Westwood 17 3.6 303 Elaine 301 Wilshire 17 3.9

401 James 183 Westwood 17 3.6 401 James 183 Westwood 17 3.6

401 James 183 Westwood 17 3.6 208 Esther 421 Gayley 20 3.1

208 Esther 421 Gayley 20 3.1 301 John 183 Westwood 19 2.1

208 Esther 421 Gayley 20 3.1 303 Elaine 301 Wilshire 17 3.9

208 Esther 421 Gayley 20 3.1 401 James 183 Westwood 17 3.6

208 Esther 421 Gayley 20 3.1 208 Esther 421 Gayley 20 3.1

R.sid R.name R.Addr R.Age R.GPA S.Sid S.Name S.Addr S.Age S.GPA

301 John 183 Westwood 19 2.1 301 John 183 Westwood 19 2.1

301 John 183 Westwood 19 2.1 401 James 183 Westwood 17 3.6

303 Elaine 301 Wilshire 17 3.9 303 Elaine 301 Wilshire 17 3.9

401 James 183 Westwood 17 3.6 301 John 183 Westwood 19 2.1

401 James 183 Westwood 17 3.6 401 James 183 Westwood 17 3.6

208 Esther 421 Gayley 20 3.1 208 Esther 421 Gayley 20 3.1

R.name S.Name

John John

John James

Elaine Elaine

James John

James James

Esther Esther

R.name S.Name

James John

The Division Operator / Give me the SIDs of students who are enrolled in all

of the CS classes sid(Student) – sid(sid(Student dept, cnum,

sec(dept=’CS’(Class))) – Enroll)Student






Class






Enroll

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

The Division Operator / Give me the SIDs of students who are enrolled in all

of the CS classes sid(Student) –

sid

(sid(Student)

dept, cnum, sec

(dept=’CS’(Class)

)– Enroll)

)









sid dept cnum sec

301 CS 143 01

301 CS 112 01

303 CS 143 01

303 CS 112 01

401 CS 143 01

401 CS 112 01

208 CS 143 01

208 CS 112 01

dept cnum sec

CS 143 01

CS 112 01

sid

301

303

401

208

sid dept cnum sec

301 CS 143 01

301 EE 301 01

303 CS 112 01

401 EE 183 01

sid dept cnum sec

303 CS 143 01

401 CS 143 01

401 CS 112 01

208 CS 143 01

208 CS 112 01

sid

301

303

401

208

sid

301

sid

303

401

208

the student database student sidnameaddragegpa 301john183 westwood192.1 303elaine301 wilshire173.9...

Documents

1301john183 westwood192

1401james183 westwood173

6301john183 westwood192

6401james183 westwood173

9301john183 westwood192

1208esther421 gayley203

9401james183 westwood173

9303elaine301 wilshire173