A is correct:
Explanation:
A. Replace empty values with a specified value.: This is correct. The fillnull command is used to replace null or empty values in specified fields with a default value that you can specify when using the command.
B. Rename a specific field in the search results.: This is incorrect. To rename fields, you would typically use the rename command.
C. Create a new field based on the values in an existing field.: This is incorrect. To create a new field based on existing values, you would use the eval command.
D. Replace all values in a specific field with a default value.: This is incorrect. The fillnull command specifically targets null or empty values and does not change values that are already present.
Thus, the correct answer is A. Replace empty values with a specified value.
upvoted 2 times
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ismailwale
3 weeks, 4 days ago