We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [relational-algebra]

the study of relations (i.e., database tables) and relational operators (join, selection, projection, etc.) as a kind of algebraic structure.

Filter by
Sorted by
Tagged with
5
votes
4answers
3k views

When should you use the existential and universal quantifiers for Relational Calculus?

Could someone explain to me WHEN do you use existential and universal quantifiers for Relational Calculus? Given this schema: Hotel(hotelNo, hotelName, city) ...
3
votes
2answers
6k views

Expressing division in relational algebra in terms of other operations

So, I've been conferred upon the opinion that: Union, difference, cross product, selection, projection form the "complete set of relational operations". That is, any other relational operation ...