We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
Loading...
  1. Practice
  2. Databases
  3. Relational Algebra
  4. Relational Algebra - 3
  5. Discussions

Relational Algebra - 3

Sort 9 Discussions, By:

votes

  • hiteshchechani29 + 1 comment

    What is Equijoins vs Natural Join

    • AllisonP + 1 comment

      An Equijoin is a Theta Join that only involves equalities; for reference, a Theta Join joins on a formula (theta) that consists of arithmetic comparisons between attributes of the sets being joined. A Natural Join is an Equijoin that returns all tuples agreeing on the values of their common attributes.

      • chadwalt + 0 comments

        When do we get to use them?

  • aiswarya110498 + 0 comments

    Equijoin - as the name itself indicates - join with equality operator.

  • INTRAJACK + 1 comment

    Helpful https://www.cs.scranton.edu/~mccloske/courses/cmps340/rel_alg_intro_lec.html

    • parathantl + 0 comments

      Really Thanks man... It was much helpful

  • ken_ingram + 0 comments

    This particular challenge is the first I've heard of equijoins.

    Where are they first discussed in any text?

  • dnadanushka + 0 comments

    Could someone suggest me a book to learn relational algebra?

  • Mkce_15bcs2103 + 0 comments

    why is the points which we have gained in distributes systems is not including in my hackos?? pls tell me i hav ernes so many points in that??

  • Gee_V + 1 comment

    There is a typo in the question:"Which is {a} join condition contains an equality operator?"

    {a} should be deleted

    • jedijesse + 1 comment

      "Which is join condition contains an equality operator" isn't really a proper sentence either... should get rid of "is" as well.

      • Cezille07 + 0 comments

        2 years later, this question is still wrong.

  • thiloplanz + 0 comments

    A Natural Join also contains equalities ...

  • mega_mind + 1 comment

    The answer wouldn't lock.

    https://drive.google.com/file/d/0ByYJcD7ZxhFWVGdmRHlXeE9iWk0/view?usp=sharing

    • mega_mind + 0 comments

      https://drive.google.com/file/d/0ByYJcD7ZxhFWaFU2R055ZWc5eWs/view?usp=sharing

No more comments