Oracle - Working with Program Data MCQ

Oracle – Working with Program Data

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

To simplify code

To perform calculations

To define data characteristics

To declare variables

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2. In PL/SQL, what is the primary use of character data types?

To store numeric values

To store date and time information

To store text and character-based information

To store binary data

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3. Which datatype in PL/SQL is used to store whole numbers?

VARCHAR2

DATE

BINARY_INTEGER

BOOLEAN

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4. What datatype is used to store date and time information in PL/SQL?

CHAR

DATE

BINARY_FLOAT

BOOLEAN

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5. What datatype is used to represent true or false values in PL/SQL?

BINARY_INTEGER

DATE

BOOLEAN

VARCHAR2

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6. In PL/SQL, what datatype is used to store binary data such as images or documents?

BLOB

BOOLEAN

CHAR

NUMBER

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7. What does the ROWID datatype in PL/SQL represent?

A unique identifier for a row in a database table

A binary number

A date and time value

A character string

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8. In PL/SQL, what is the purpose of REF CURSORs?

To store date and time information

To declare variables

To store binary data

To work with result sets

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9. What datatype in PL/SQL is used for internet-related data, such as email addresses and URLs?

URIType

CLOB

VARCHAR2

BOOLEAN

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10. What is the purpose of “ANY” datatypes in PL/SQL?

To handle various datatypes generically

To simplify code

To declare variables

To create custom datatypes

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11. What is the primary use of user-defined datatypes in PL/SQL?

To create custom datatypes

To store binary data

To store date and time information

To declare variables

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12. In PL/SQL, what does declaring a variable mean?

Stating the variable's datatype

Initializing the variable with a default value

Reserving memory for the variable

Assigning a value to a variable

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13. What is the primary benefit of declaring constants in PL/SQL?

To store date and time information

To declare variables

To store binary data

To simplify code

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14. What does the “NOT NULL” clause indicate when declaring a variable in PL/SQL?

That the variable can only store NULL values

That the variable cannot be declared

That the variable must have a value assigned to it

That the variable must be anchored to a cursor

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15. What is the purpose of anchored declarations in PL/SQL?

To store binary data

To simplify code

To declare variables

To associate a variable with a cursor or table column

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16. In PL/SQL, what are the benefits of anchoring declarations to cursors and tables?

It ensures the variable is initialized

It prevents datatype errors

It allows dynamic data binding

It simplifies code

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17. When anchoring a declaration to a NOT NULL datatype in PL/SQL, what does it enforce?

That the variable can only store binary data

That the variable must be declared as VARCHAR2

That the variable must have a default value

That the variable cannot store NULL values

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18. What is the purpose of programmer-defined subtypes in PL/SQL?

To declare variables

To store binary data

To simplify code

To create custom datatypes based on existing ones

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19. In PL/SQL, what is implicit data conversion?

The use of constants

The use of custom subtypes

Automatically converting data between compatible datatypes

Explicitly converting data from one datatype to another

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20. What is the primary purpose of explicit datatype conversion in PL/SQL?

To simplify code

To avoid errors due to implicit conversion

To store binary data

To create custom datatypes

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21. In PL/SQL, what is the purpose of the NOT NULL clause when declaring a variable?

To enforce that the variable must always have a value assigned

To simplify code

To declare the datatype of the variable

To declare a variable

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22. What is the purpose of REF CURSORs in PL/SQL?

To declare variables

To work with result sets

To store date and time information

To store binary data

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23. In PL/SQL, what does the ROWID datatype represent?

A binary number

A date and time value

A unique identifier for a row in a database table

A character string

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Oracle – Working with Program Data MCQ