IPT - A Virtual Approach IPT A Virtual Approach by Peter Whitehouse
Quick Links:
 
 
back
Information and Intelligent Systems Social and Ethical Implications Human Computer Interaction Software and Systems Engineering eXercise Files Course Outline and Assessment A-Z of Geeky Acronyms Terrace Work Program 2004 Sillybus FAQ = Frequently Asked Questions Help
 
 
Database Design eXercises #3

Uniqueness Constraints

1.

right/wrong

X1: every entity plays at least one role

X2: every role is played by exactly one entity

X3: every role is played by exactly one entity

X4: incorrectly formed nest

3.
Patient(patientid) has name PersonName
Patient(patientid) was admitted by Doctor(drid)
Doctor(drid) has name PersonName
[Patient(patientid) was observed at DateTime(datetimestamp)]= observation
observation had recorded Temperature(degreesc)
observation had observed BloodPressure(bptext)
observation had additional Note(notetext)
Doctors and Nurses

4.
Applicant(applicantid) is called PersonName
Applicant(applicantid) has gender(gcode)
Applicant(applicantid) was born in Year(adcode)
Applicant(applicantid) can be reached by Phone(phnum)
Applicant(applicantid) cites Referee(refereename) who is contactible by Phone(phnum)
[Applicant(applicantid) began working in Year(adcode) for Company(coname)] = job
job entailed Position(positionname)
job finished in Year(adcode)
resume

5.
Program(gcode) is called ProgramName
Program(gcode) is shown on Channel(channelcode)
Channel(channelcode) is called ChannelName
Program(gcode) starts on Time(ampmcode)
Program(gcode) screens on Date(adcode)
Program(gcode) stars Actor(actorname)
Program(gcode) described by Synopsis(plotdescription)
Program(gcode) is rated as Rating(starcount)
Program(gcode) is classified as Classification(classcode)
Program(gcode) has consumeradvice Advice(advicecode)
Advice(advicecode) stands for AdviceName
Classification(classcode) means ClassificationName
tvguide

wonko@wonko.info
©Copyright t 1992..2018+. Edition 26.150117
wonkosite
Creative Commons License
This work is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 2.1 Australia License
.