Oracle - Dates and Timestamps MCQ

Oracle – Dates and Timestamps

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1. What is the purpose of datetime datatypes in Oracle PL/SQL?

To store numeric values

To work with date and time information

To store character data

To declare variables

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2. Which datatype in PL/SQL is used to store date and time information with fractional seconds?

INTERVAL

TIMESTAMP

NUMBER

DATE

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3. When should you use INTERVAL datatypes in PL/SQL?

To represent time intervals

To perform calculations with numeric values

To declare variables

To store character data

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4. How can you declare an INTERVAL variable in PL/SQL?

By using the TO_DATE function

By using the VARCHAR2 datatype

By using the DECLARE INTERVAL statement

By using the INTERVAL keyword

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5. What is the primary purpose of datetime conversions in PL/SQL?

To convert between different date and time formats

To simplify code

To declare variables

To store character data

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6. How can you convert a string to a datetime value in PL/SQL?

By using the TO_NUMBER function

By using the CAST function

By using the TO_CHAR function

By using the TO_DATE function

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7. What is the purpose of the TO_CHAR function in PL/SQL?

Converts a number to a character string

Converts a date to a character string

Converts a character string to a date

Converts a character string to a number

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8. How can you work with time zones in PL/SQL?

By using the TO_CHAR function

By using the TO_DATE function

By using the TO_NUMBER function

By using the TIMESTAMP WITH TIME ZONE datatype

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9. When is it necessary to require a format mask to match exactly in PL/SQL datetime operations?

When working with intervals

It is never necessary

When converting strings to dates

When converting dates to strings

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10. What does the EXTRACT function do in PL/SQL?

Converts a date to a character string

Converts a character string to a number

Converts a number to a character string

Extracts a specified component (e.g., year, month) from a datetime value

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11. How can you perform date arithmetic with intervals and datetimes in PL/SQL?

By using the INTERVAL datatype

By using the TO_NUMBER function

By using the TO_CHAR function

By using the TO_DATE function

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12. What does the INTERVAL datatype in PL/SQL represent?

A numeric value

A single point in time

A date and time value

A duration of time

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13. What is the purpose of date arithmetic with DATE datatypes in PL/SQL?

To represent time intervals

To simplify code

To perform calculations with numbers

To store character data

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14. How do you compute the interval between two datetime values in PL/SQL?

By subtracting the two datetime values

By using the TO_CHAR function

By using the TO_DATE function

By using the TO_NUMBER function

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15. What happens when you mix DATEs and TIMESTAMPs in PL/SQL?

An error occurs

The values are automatically converted

The values are compared numerically

The values are concatenated

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16. How can you add and subtract intervals in PL/SQL?

By using the TO_CHAR function

By using arithmetic operators (+, -)

By using the TO_DATE function

By using the TO_NUMBER function

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17. What is the primary purpose of the CAST function in PL/SQL?

To perform calculations with numbers

To simplify code

To convert between different datatypes

To store character data

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18. What is the primary purpose of the EXTRACT function in PL/SQL?

To store character data

To perform calculations with numbers

To convert between different datatypes

To extract specific components (e.g., year, month) from datetime values

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19. What is the primary purpose of datetime datatypes in Oracle PL/SQL?

To store numeric values

To declare variables

To store character data

To work with date and time information

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Oracle – Dates and Timestamps MCQ