Data Processing and Storage Quiz
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Questions and Answers

What do we call structured data types in the context of data processing?

  • Persons and places
  • Numbers and texts (correct)
  • Images and videos
  • Dates and documents
  • In a database system environment, what does the term 'entity' refer to?

  • Numbers or texts
  • Hardware or software
  • People, places, things, or events (correct)
  • Images or videos
  • What is the purpose of a database system in relation to data?

  • Secure data transmission
  • Increase knowledge using processed data (correct)
  • Produce optical discs for storage
  • Create unstructured data formats
  • Which of the following is NOT one of the basic building blocks of data models?

    <p>Hardware</p> Signup and view all the answers

    How is a One-to-Many Relationship defined?

    <p>One entity associated with many related entities</p> Signup and view all the answers

    What represents an association among entities in a data model?

    <p>Relationship</p> Signup and view all the answers

    What is the process of defining one or more subtypes of the supertype and forming supertype/subtype relationships?

    <p>Specialization</p> Signup and view all the answers

    Which rule specifies that each entity instance of the supertype must be a member of some subtype in the relationship?

    <p>Total specialization rule</p> Signup and view all the answers

    In the context of employees, which group would likely have the attribute 'Stock Option'?

    <p>Salaried employees</p> Signup and view all the answers

    Which is a type of constraint that addresses whether an instance of the supertype must also be a member of at least one subtype?

    <p>Completeness constraint</p> Signup and view all the answers

    What is the direct reverse process of generalization in entity modeling?

    <p>Specialization</p> Signup and view all the answers

    If an entity is either an outpatient or a resident patient, it adheres to which rule?

    <p>Total specialization rule</p> Signup and view all the answers

    What does the double line extending from PATIENT entity type to the circle indicate?

    <p>Total specialization</p> Signup and view all the answers

    In the example provided, what are the subtypes of the entity type PART?

    <p>MANUFACTURED PART and PURCHASED PART</p> Signup and view all the answers

    What does the Disjoint Rule specify in a data model?

    <p>An entity instance can only belong to one subtype</p> Signup and view all the answers

    What is a subtype discriminator in an ER diagram?

    <p>An attribute of the supertype that determines the target subtype</p> Signup and view all the answers

    Why is MOTORCYCLE not represented as a subtype of VEHICLE in the data model?

    <p>Because it is not necessary for all vehicle types to be subtyped</p> Signup and view all the answers

    What does the partial specialization rule signify in an ER diagram?

    <p>An entity instance is allowed to belong to any number of subtypes</p> Signup and view all the answers

    To declare a variable as a record based on a specific table's structure in PL/SQL, which syntax should be used?

    <p>record_name table_name%ROWTYPE;</p> Signup and view all the answers

    What is the primary purpose of using explicit cursors in PL/SQL?

    <p>To return more than one row from a SELECT statement</p> Signup and view all the answers

    What is the function of context areas and cursors in PL/SQL?

    <p>To allocate memory for SQL statements' processing</p> Signup and view all the answers

    What distinguishes PL/SQL records from rows in a database table?

    <p>PL/SQL records are not the same as rows in a database table</p> Signup and view all the answers

    Which of the following is true about user-defined records in PL/SQL?

    <p>User-defined records can be components of other nested records</p> Signup and view all the answers

    What is the starting keyword to define a record structure in PL/SQL?

    <p>TYPE</p> Signup and view all the answers

    Which PL/SQL feature allows you to nest loops to multiple levels?

    <p>FOR loop</p> Signup and view all the answers

    What is the purpose of the %ROWTYPE attribute in PL/SQL?

    <p>To refer to a PL/SQL record as a whole</p> Signup and view all the answers

    Why is it important to distinguish between an implicit and an explicit cursor in PL/SQL?

    <p>To write efficient PL/SQL code</p> Signup and view all the answers

    What is the primary purpose of declaring a cursor and manipulating it in a FOR loop in PL/SQL?

    <p>To fetch data into a variable using a cursor</p> Signup and view all the answers

    Which of the following is NOT a way to define fields in a PL/SQL record?

    <p>%ROWTYPE attribute</p> Signup and view all the answers

    In PL/SQL, what type of data items are stored as fields in a record?

    <p>%ROWTYPE attribute and scalar data types</p> Signup and view all the answers

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