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A condition is referred to as __________

  • Q.

    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.

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Similar Questions

  • 1.

    Which join refers to join records from the write table that have no matching key in the left table are include in the result set:

  • filter_dramaExplanation
    Answer is : B

    A right outer join will return all the rows that an inner join returns plus one row for each of the other rows in the second table that did not have a match in the first table. It is the same as a left outer join with the tables specified in the opposite order.

    Outer joins are of following three types.

    1. Left outer join
    2. Right outer join
    3. Full outer join

    Right Outer Join : The right join operation returns all record from right table and matching records from the left table. On a matching element not found in left table, NULL is represented in that case.

     

  • 2.

    Which operation are allowed in a join view:

  • filter_dramaExplanation
    Answer is : D

    The DELETE statement is used to delete rows in a table. The UPDATE statement is used to update existing records in a table. The INSERT INTO statement is used to insert new records in a table.

  • 3.

    Which view that contains more than one table in the top-level FROM clause of the SELECT statement:

  • filter_dramaExplanation
    Answer is : C

    The DELETE statement is used to delete rows in a table. The UPDATE statement is used to update existing records in a table. The INSERT INTO statement is used to insert new records in a table.

  • 4.

    Given two tables R1(x, y) and R2(y, z) with 50 and 30 number of tuples respectively. Find maximum number of tuples in the output of natural join between tables R1 and R2 i.e. R1 * R2? (*. Natural Join)

  • filter_dramaExplanation
    Answer is : D

    Concept:

    A natural join is based on common attributes or common columns to join two tables or relations.

    Explanation:

    Consider an example, suppose there are two tables Employee(Eid, Ename) consists of 5 tuples and department(Eid, Did) consists of 3 tuples only.

    Eid

    Ename

    1

    E1

    1

    E2

    1

    E3

    1

    E4

    1

    E5

     

    Eid

    Did

    1

    D1

    1

    D2

    1

    D3

     

    Natural join of employee and department(Employee * Department) gives:

    5 × 3 = 15

    So, maximum number of tuples in natural join are from the relation having minimum tuples. So, in given question, R2 contains 30 tuples, so , maximum number of tuples in the output of natural join between tables R1 and R2 i.e. R1 * R2 = 50 × 30 = 1500.

  • 5.

    In SQL the statement select * from R, S is equivalent to

  • filter_dramaExplanation
    Answer is : B

    A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates.

    A CROSS JOIN or CARTESIAN JOIN returns the Cartesian product of an available set of records from multiple joined tables. Thus, this join would equate to an inner join in which the join-condition always evaluates to either True or wherever the join-condition is not present in the statement.

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