[04/Vienne/06]

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What data type is often used for storing MD5 hash keys?

varchar(max)

int

char(32) (correct)

XML

In what timezone are the timestamps always stored?

EST

PST

UTC (correct)

CST

Which data type is often unbound in size?

char(32)

varchar(max) (correct)

smallint

int

Data types are often generic and unbound in size

True Signup and view all the answers

JSONB is preferred over JSON for semi-structured data types

True Signup and view all the answers

Timestamps are stored in local time zone

False Signup and view all the answers

Match the following data types with their characteristics:

char(32) = Used for storing MD5 hash keys UTC timestamps = Always in UTC without timezone jsonb = Preferred over json for semi-structured data types varchar(max) = Often unbound in size Signup and view all the answers

Match the following data type characteristics with their descriptions:

Generic data types = Often generic (e.g., int over smallint) Semi-structured data types = Comparison of XML vs. JSON vs. arrays Unbound data types = Often unbound in size (e.g., varchar(max)) JSON vs. jsonb = Use of jsonb over json Signup and view all the answers

Match the following data type characteristics with their usage:

XML vs. JSON vs. arrays = Semi-Structured data types char(32) = Storing MD5 hash keys varchar(max) = Unbound in size UTC timestamps = Always in UTC without timezone Signup and view all the answers

What does a UTC timestamp in PostgreSQL represent?

Coordinated Universal Time Signup and view all the answers

How is the UTC timestamp data type represented in PostgreSQL?

8-byte integer Signup and view all the answers

What does the to_timestamp() function do in PostgreSQL?

Converts a string representation of a date or time to a UTC timestamp Signup and view all the answers

What is the primary advantage of using UTC timestamps in PostgreSQL?

Standardized Time Representation Signup and view all the answers

What does the extract() function do in PostgreSQL with respect to a UTC timestamp?

Extracts specific components of a UTC timestamp, such as year, month, day, hour, minute, and second Signup and view all the answers

What is the purpose of the current_timestamp() function in PostgreSQL?

Returns the current UTC timestamp Signup and view all the answers

UTC timestamps in PostgreSQL are represented using a 4-byte integer that stores the number of seconds since the Unix epoch.

False Signup and view all the answers

The to_timestamp() function in PostgreSQL converts a string representation of a date or time to a UTC timestamp.

True Signup and view all the answers

Using UTC timestamps in PostgreSQL allows for precise and consistent storage of timestamps across different systems and environments.

True Signup and view all the answers

The current_timestamp() function in PostgreSQL returns the current UTC timestamp.

True Signup and view all the answers

PostgreSQL provides various functions and operators for working with UTC timestamps, including timestamp_tz() to convert a UTC timestamp to a timestamp with time zone.

True Signup and view all the answers

UTC timestamps in PostgreSQL do not provide standardized representation of dates and times, ensuring consistency across different time zones and regions.

False Signup and view all the answers

Extract() function in PostgreSQL can be used to extract specific components of a UTC timestamp, such as year, month, day, hour, minute, and second.

True Signup and view all the answers

UTC timestamps in PostgreSQL are often stored in the local time zone.

False Signup and view all the answers

The primary advantage of using UTC timestamps in PostgreSQL is the standardized time representation and consistency across different time zones and regions.

True Signup and view all the answers

UTC timestamp data type in PostgreSQL is represented using an 8-byte integer that stores the number of seconds since the Unix epoch.

True Signup and view all the answers

Data types in PostgreSQL are often generic and unbound in size.

False Signup and view all the answers

UTC timestamps in PostgreSQL store timestamps with low precision, disallowing precise calculations and comparisons.

False Signup and view all the answers

Match the following functions/operators with their usage in PostgreSQL for working with UTC timestamps:

to_timestamp() = Converts a string representation of a date or time to a UTC timestamp current_timestamp() = Returns the current UTC timestamp timestamp_tz() = Converts a UTC timestamp to a timestamp with time zone extract() = Extracts specific components of a UTC timestamp, such as year, month, day, hour, minute, and second Signup and view all the answers

Match the following advantages with using UTC timestamps in PostgreSQL:

Standardized Time Representation = UTC timestamps provide a standardized representation of dates and times, ensuring consistency across different time zones and regions Precision and Accuracy = UTC timestamps store timestamps with high precision, allowing for precise calculations and comparisons Flexibility in Time Zone Representation = UTC timestamps offer flexibility in representing different time zones and regions Efficient Storage = UTC timestamps allow for efficient storage of date and time information Signup and view all the answers

Match the following data type characteristics with their descriptions:

8-byte integer representation = UTC timestamp data type in PostgreSQL is represented using an 8-byte integer that stores the number of seconds since the Unix epoch Consistent Storage = Using UTC timestamps in PostgreSQL allows for precise and consistent storage of timestamps across different systems and environments Local Time Zone Representation = UTC timestamps in PostgreSQL are commonly stored and represented in the local time zone Generic and Unbound in Size = Data types in PostgreSQL are often generic and unbound in size Signup and view all the answers

[04/Vienne/06]

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Questions and Answers

What data type is often used for storing MD5 hash keys?

In what timezone are the timestamps always stored?

Which data type is often unbound in size?

Data types are often generic and unbound in size

JSONB is preferred over JSON for semi-structured data types

Timestamps are stored in local time zone

Match the following data types with their characteristics:

Match the following data type characteristics with their descriptions:

Match the following data type characteristics with their usage:

What does a UTC timestamp in PostgreSQL represent?

How is the UTC timestamp data type represented in PostgreSQL?

What does the to_timestamp() function do in PostgreSQL?

What is the primary advantage of using UTC timestamps in PostgreSQL?

What does the extract() function do in PostgreSQL with respect to a UTC timestamp?

What is the purpose of the current_timestamp() function in PostgreSQL?

UTC timestamps in PostgreSQL are represented using a 4-byte integer that stores the number of seconds since the Unix epoch.

The to_timestamp() function in PostgreSQL converts a string representation of a date or time to a UTC timestamp.

Using UTC timestamps in PostgreSQL allows for precise and consistent storage of timestamps across different systems and environments.

The current_timestamp() function in PostgreSQL returns the current UTC timestamp.

PostgreSQL provides various functions and operators for working with UTC timestamps, including timestamp_tz() to convert a UTC timestamp to a timestamp with time zone.

UTC timestamps in PostgreSQL do not provide standardized representation of dates and times, ensuring consistency across different time zones and regions.

Extract() function in PostgreSQL can be used to extract specific components of a UTC timestamp, such as year, month, day, hour, minute, and second.

UTC timestamps in PostgreSQL are often stored in the local time zone.

The primary advantage of using UTC timestamps in PostgreSQL is the standardized time representation and consistency across different time zones and regions.

UTC timestamp data type in PostgreSQL is represented using an 8-byte integer that stores the number of seconds since the Unix epoch.

Data types in PostgreSQL are often generic and unbound in size.

UTC timestamps in PostgreSQL store timestamps with low precision, disallowing precise calculations and comparisons.

Match the following functions/operators with their usage in PostgreSQL for working with UTC timestamps:

Match the following advantages with using UTC timestamps in PostgreSQL:

Match the following data type characteristics with their descriptions:

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