C-06-Q035mediumsingle_mcq
Why can using class + section + roll number as a composite key cause a problem when keeping records of passed-out students?
Why can using class + section + roll number as a composite key cause a problem when keeping records of passed-out students?
- aComposite keys cannot store text
- bOld students can create conflicting records with current students
- cThe database deletes old records automatically
- dRoll numbers cannot be integers