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What is Join Operation denoted by?

  • Q.

    What is Join Operation denoted by?

  • filter_dramaExplanation
    Answer is : D

    Join Operation is denoted by ⋈.

    A JOIN clause is used to combine rows from two or more tables, based on a related column between them.

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Similar Questions

  • 1.

    A condition is referred to as __________

  • filter_dramaExplanation
    Answer is : B

    An SQL join clause combines records from two or more tables in a database. It creates a set that can be saved as a table or used as it is. A JOIN is a means for combining fields from two tables by using values common to each.

  • 2.

    Which of the following Relational Algebra operations can be used when you want to keep all the tuples of the first relation irrespective of whether or not they have matching tuples in the second relation?

  • filter_dramaExplanation
    Answer is : B

    The answer to the above question is Option 2) Left-outer Join
    A JOIN clause is used to combine rows from two or more tables, based on a related column between them.

    Here are the different types of the JOINs in SQL:

    1. (INNER) JOIN: Returns records that have matching values in both tables
    2. LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table
    3. RIGHT (OUTER) JOIN: Returns all records from the right table, and the matched records from the left table
    4. FULL (OUTER) JOIN: Returns all records when there is a match in either left or right table

    We can see that left join keeps all the elements from the first relation irrespective of their presence in second relation.

  • 3.
    SELECT *
      FROM student JOIN takes USING (ID);

    The above query is equivalent to

  • filter_dramaExplanation
    Answer is : A

    Join can be replaced by inner join.

  • 4.

    Consider the following three tables R, S and T. In this question, all the join operations are natural joins (⋈) . (π) is the projection operation of a relation:

    What is the resulting table of πA,B(R⨝T) ⨝ πB,C(S⨝T) ?

  • filter_dramaExplanation
    Answer is : A

    A) option is option return all possible results after natural join but it does not involve the table t during natural join so false

    In b )option record  5 6 4 and record 1 2 2 not possible in result so false

    In c) option record 5 2 4 abd record 1 6 2 nit possible after natural join of table .

    In d) option it contain partial result after joining all three table

    So d option should be answer

  • 5.

    All ____ from multiple tables matching the join condition are returned by the inner join.

  • filter_dramaExplanation
    Answer is : A

    All rows from multiple tables matching the join condition are returned by the inner join.

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