Answer:
Join
Explanation:
Five basic set operators in relational algebra are as follows:
- Selection - tuple selection
- Projection - extract columns
- Cartesian product - cross product of relations
- Set union - union of two relations
- Set difference - minus operation on two relations
As we can see, Join is not part of the basic set operations but it is implemented using the Cartesian Product operator.
Answer:
optical
Explanation:
The earliest of these was the magnetic device. Computer systems began with magnetic storage in the form of tapes (yes, just like a cassette or video tape). These graduated to the hard disk drive and then to a floppy disk.
Answer:
you could say something like your friends or your pets if you have any pets you could say something like you are grateful that we now have 3 vaccines for the Coronavirus or like you are grateful for your hobbies because it gives you something to do in your free time.
Explanation:
i hope this helps.
