The UNLOAD statement is similar to the OUTPUT statement in that they both export query results to a file. However, the UNLOAD statement exports data more efficiently in a text format. The UNLOAD statement exports with one row per line, with values separated by a comma delimiter.
Use the UNLOAD statement to unload data when you want to:
export query results if performance is an issue
store output in text format
embed an export command in an application
export data to a file on a client computer
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