Discover the essential Snowflake command to identify file names for each row of staged data. Master this key concept for your SnowPro Core certification and enhance your data management skills.
Table of Contents
Question
Which command is used to determine the file name of each row of data from a staged file?
A. SHOW FILE FORMATS
B. SELECT METADATA$FILE_CONTENT_KEY
C. SELECT METADATA$FILE_ROW_NUMBER
D. SELECT METADATA$FILENAME
Answer
D. SELECT METADATA$FILENAME
Explanation
In Snowflake, the METADATA$FILENAME function is used to determine the file name of each row of data from a staged file. This function is particularly useful when querying data from external stages or tables created from staged files.
Here’s a more detailed breakdown of the options and why D is the correct choice:
A. SHOW FILE FORMATS – This command is used to display information about file formats in your Snowflake account. It doesn’t provide information about individual rows or file names.
B. SELECT METADATA$FILE_CONTENT_KEY – This function returns a unique identifier for the file containing the row, but not the actual file name.
C. SELECT METADATA$FILE_ROW_NUMBER – This function returns the row number within the file for each row of data, but not the file name itself.
D. SELECT METADATA$FILENAME – This is the correct function to use when you want to retrieve the name of the file from which each row of data originated.
When working with staged files in Snowflake, you can use METADATA$FILENAME in your SELECT statements to include the source file name in your query results. This is particularly helpful when you’re dealing with multiple files in a stage and need to track which file each row of data came from.
For example, you might use a query like this:
SELECT METADATA$FILENAME, t.* FROM @my_stage (FILE_FORMAT => my_file_format) t;
This query would return the file name for each row along with all the columns from the staged data.
Understanding how to use METADATA$FILENAME is crucial for effective data management and troubleshooting in Snowflake, making it an important concept to master for the SnowPro Core certification exam.
Snowflake SnowPro Core certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Snowflake SnowPro Core exam and earn Snowflake SnowPro Core certification.