University of Helsinki,
Department of Computer Science,
Basics of Databases, spring 2000
© Harri Laine
Exercises about relational algebra
Löytyykö sellaisia henkilöitä, jotka mahdollisesti ovat sekä opiskelijoita että opettajia
Are there any persons that are both teachers and students
p
tlname,tfname
(teacher)
Ç p
slname,sfname
(student)
Actually this finds out teachers and students that have the same name.