Oracle - Collections MCQ

Oracle – Collections

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1. What is the primary purpose of collections in PL/SQL?

Managing multiple values as a single unit

Storing character data

Storing binary data

Performing calculations

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2. What are the different types of collections in PL/SQL?

Index-by-table, Nested table, VARRAY

Scalar, Complex, Multiset

Numeric, Character, Boolean

Integer, VARCHAR2, DATE

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3. How do you declare a collection variable in PL/SQL?

Using the COLLECTION keyword

Using the NUMBER datatype

Using the DECLARE statement

Using the TYPE keyword

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4. What is the COUNT method used for in PL/SQL collections?

To check if an element exists in a collection

To delete elements from a collection

To extend the size of a collection

To count the number of elements in a collection

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5. What does the DELETE method do in PL/SQL collections?

Deletes a specific element from a collection

Extends the size of a collection

Checks if an element exists in a collection

Deletes all elements from a collection

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6. How can you use the EXISTS method in PL/SQL collections?

To delete all elements from the collection

To check if a specific element exists in the collection

To count the number of elements in the collection

To extend the collection

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7. What is the purpose of the EXTEND method in PL/SQL collections?

To extend the duration of a collection

To extend the number of collection methods

To extend the size of a collection

To extend the datatype of a collection

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8. Which methods allow you to retrieve the first and last elements of a PL/SQL collection?

FIRST and DELETE

COUNT and LIMIT

TRIM and EXTEND

LAST and PRIOR

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9. What is the primary function of the LIMIT method in PL/SQL collections?

To check if an element exists in a collection

To delete elements from a collection

To set a maximum limit for the number of elements in a collection

To extend the size of a collection

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10. What do the PRIOR and NEXT methods do in PL/SQL collections?

Extend the size of a collection

Check if an element exists in a collection

Delete elements from a collection

Retrieve the previous and next elements of a collection

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11. How does the TRIM method work in PL/SQL collections?

Counts the number of elements in a collection

Deletes specific elements from a collection

Retrieves the last element of a collection

Extends the size of a collection

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12. When declaring collection types in PL/SQL, what do you specify?

The collection methods to be used

The size of the collection

The number of elements in the collection

The data type of the elements

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13. How do you declare and initialize a collection variable in PL/SQL?

Using the := operator

Using the TYPE keyword

Using the COLLECTION keyword

Using the DECLARE statement

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14. What is the process of populating collections with data in PL/SQL?

Using DELETE statements

Using UPDATE statements

Using INSERT INTO statements

Using SELECT INTO statements

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15. How can you access data inside a collection in PL/SQL?

Using a cursor

Using a loop

Using the DELETE method

Using the EXTEND method

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16. What are string-indexed collections in PL/SQL primarily used for?

Storing character data

Storing dates and times

Storing numeric data

Storing binary data

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17. In PL/SQL, what type of data can be stored in collections of complex datatypes?

Neither simple nor complex datatypes

Only character datatypes

Both simple and complex datatypes

Only simple datatypes

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18. What are multilevel collections in PL/SQL?

Nested collections within other collections

Collections with multiple methods

Collections with complex datatypes

Collections that store multiple values

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19. How can you work with collections in SQL in PL/SQL?

Using INSERT INTO statements

Using SELECT statements

Using UPDATE statements

Using DELETE statements

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20. What are nested table multiset operations in PL/SQL used for?

Performing operations on nested tables

Retrieving data from a single table

Performing operations on multiple tables

Sorting data in a table

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21. How can you test equality and membership of nested tables in PL/SQL?

Using the LIMIT method

Using the PRIOR method

Using the EXISTS method

Using the COUNT method

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22. What does it mean to perform high-level set operations on nested tables in PL/SQL?

Performing operations that affect the entire table

Performing mathematical operations on nested tables

Combining multiple nested tables into a single nested table

Performing operations on multiple nested tables

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23. How are duplicates handled in a nested table in PL/SQL?

Duplicates are not allowed

Duplicates are counted separately

Duplicates are automatically removed

Duplicates are stored in a separate table

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24. What privileges are necessary to maintain schema-level collections in PL/SQL?

CREATE privilege

SELECT privilege

ALTER privilege

EXECUTE privilege

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25. In PL/SQL, what does the data dictionary store information about regarding collections?

The names and structures of collections

The history of collection operations

The number of elements in each collection

The privileges required to access collections

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Oracle – Collections MCQ