remove mysql
sudo apt-get remove --purge mysql* -y
sudo apt-get autoremove -y
sudo apt-get autoclean
remove mysql
sudo apt-get remove --purge mysql* -y
sudo apt-get autoremove -y
sudo apt-get autoclean
mysql on delete
[CONSTRAINT [symbol]] FOREIGN KEY
[index_name] (col_name, ...)
REFERENCES tbl_name (col_name,...)
[ON DELETE reference_option]
[ON UPDATE reference_option]
reference_option:
RESTRICT | CASCADE | SET NULL | NO ACTION | SET DEFAULT
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