In case admin user of your plugin is deleting your plugin and you want your plugin to uninstall its database, this is what you must do:

• Create a directory named install. The name of this directory must be exactly install and must not change.
  
  
• Put the install directory inside your plugin's directory. For example, if your plugin's directory is my_plugin, then you must put the install directory inside the my_plugin directory like this: my_plugin/install.
  
  
• You must have an SQL file with a .sql extension which contains the various statements to drop tables and/or delete rows or perform other operations on the database. This SQL should be named uninstall.sql.
  
  
• Put the uninstall.sql file inside the install directory like so: my_plugin/install/uninstall.sql.
  
  
• That will be it. During the deletion of your plugin, the uninstall.sql will be run to execute the statements in it on the database.
  
  

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