8/13/2019 Relati0nal Algebra

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HW #1 Suggested Solutions

1. Find the last name, first name and major of all students taking any section of the course “4380”offered by the “om!uter "cience” de!artment in “Fall ##”.

$ %& '()*"+ >< $+-*/+ 2+*+ 'coursenumber & 4380 -$

'de!artmentname & “om!uter "cience”

" %& '$ >< ' "+5( 2+*+ semester&”Fall ##” 6sectionid7

" %& ''" >< *-"*5 >< ")$+6lastname, firstname, major7

Note: CD is all courses numbered 4380 offered by the Computer Science Department.  CS is the identifier of all sections of this course offered in Fall99.  S is all students ta!in" any of the sections in CS.

. Find the first name and last name of all instructors 9ho taught the course “4380” offered by the“om!uter "cience” de!artment.

5 %& '$ >< "+5(6instructorid7

5 %& '5 >< 5"*)(*6firstname, lastname7

Note. CD is the same as abo#e. $N is the id of instructor %ho tau"ht any section ofcourse 4380 from Computer Science Department. $N& is the result %hich has thename of the instructors.

3. Find the number and de!artment identifier of all courses in 9hich no student e:er got an “F”.

 F"ections %& '*-"*5 9here grade & ;F<6sectionid7

  F %& 'Fsections >< "ection6coursenumber, de!tid7

  oF %& '()*"+6coursenumber, de!tid7 = F

  Note. Fsections are the identifiers of all section in %hich a student "ot an F.FC is all courses '"i#en by course number and department id( in %hich a student

"ot an F.  Finally) NoF is the result. *e ta!e all courses and subtract from this the courses

in %hich a student "ot an F. 

8/13/2019 Relati0nal Algebra

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