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類型	備注
TRUNCATE TABLE	Removes all storage associated with a table, while preserving the table definitions.
PURGE_TABLE	Permanently removes deleted data from physical storage so that the disk space can be reused.

Reference:

http://vertica-forums.com/viewtopic.php?t=419#:~:text=The%20SQL%20Reference%20Manual%20says%20this%20about%20the,so%20that%20the%20disk%20space%20can%20be%20reused.

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