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  3. Relational Algebra
  4. Relational Algebra - 3
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Relational Algebra - 3

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  • HC
    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?

  • KI
    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?

  • MS
    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

    • JB
      jedijesse + 0 comments

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

  • 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

  • TP
    thiloplanz + 0 comments

    A Natural Join also contains equalities ...

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