Delete table statement (drop truncate delete)

grammar	Delete content	Whether to delete the definition	Whether to release space	Delete table structure	Note
drop table table_name	delete	delete	freed	delete	After removal, the table does not exist
truncate table table_name	delete	Do not delete	freed	Do not delete	Only clear table of contents, there
delete table table_name	delete	Do not delete	Does not release, use the data delete remove and then add, you can see after adding id identification discontinuous	Do not delete	Only definition content, delete the data line by line, inefficiency
delete table table_name where 条件	Delete data in accordance with conditions	Do not delete	Does not release, use the data delete remove and then add, you can see after adding id identity does not continuous.	Do not delete