MadeEasy Test Series 2019: Databases - Relational Algebra

Question

PLEASE EXPLAIN WHEATHER IT WOULD BE SOME EC DEPARMENT OR ALL EC DEPARTMENT I THINK ALL BECOZ IT IS SELECTION EID OF STUDENT WHO HAVE NOT ENROLLED IN ANY COURSE OF EC 

 

 

 

Comments

How A is correct it is saying some of the course of the Ec which means it will the output if some student have taken some ec and some not ec
It should be like which dont have taken all the Ec course
Please correct me i am confuse with some and all

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@Ayush Upadhyaya

its D then ?

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Consider four classes of students

Class A-Who take only CS courses and no student here has taken even a single EC course.

Class B-WHo Take only EC courses

Class C-Who take Some Cs course and Some EC course both at same time.

Class D-Who have taken some cs courses and all ec courses.

Final result set will include only students from class A.