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What function, combined with the copy command, should be used to unload data from a relational table into a JSON file?
Correct Answer: D
* The OBJECT_CONSTRUCT function is used to convert relational table data into JSON format. When combined with the COPY INTO command, it allows you to unload data into a JSON file. * Example: FROM (SELECT OBJECT_CONSTRUCT(*) FROM my_table) FILE_FORMAT = (TYPE = JSON); Why Other Options Are Incorrect: * A. LATERAL: Used for table functions, unrelated to JSON unloading. * B. CAST: Converts data types but does not generate JSON objects. * C. FLATTEN: Used to unpack nested JSON data, not to generate JSON. References: * OBJECT_CONSTRUCT Documentation