[04/Vienne/06]
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Questions and Answers

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

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

    JSONB is preferred over JSON for semi-structured data types

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

    Timestamps are stored in local time zone

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

    Match the following data types with their characteristics:

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

    Match the following data type characteristics with their descriptions:

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

    Match the following data type characteristics with their usage:

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

    What does a UTC timestamp in PostgreSQL represent?

    <p>Coordinated Universal Time</p> Signup and view all the answers

    How is the UTC timestamp data type represented in PostgreSQL?

    <p>8-byte integer</p> Signup and view all the answers

    What does the to_timestamp() function do in PostgreSQL?

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

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

    <p>Standardized Time Representation</p> Signup and view all the answers

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

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

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

    <p>Returns the current UTC timestamp</p> 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.

    <p>False</p> 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.

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

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

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

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

    <p>True</p> 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.

    <p>True</p> 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.

    <p>False</p> 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.

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

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

    <p>False</p> 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.

    <p>True</p> 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.

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

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

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

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

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

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

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

    Match the following advantages with using UTC timestamps in PostgreSQL:

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

    Match the following data type characteristics with their descriptions:

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

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