1. Navigate to the WordPress plugin directory of your development installation.
2. Create a text file called uninstall.php in the ch8-bug-tracker directory and open it in a code editor.
3. Start the new script with the standard <?php opening tags.
4. Implement a new function called ch8bt_drop_table by adding this code to the file:

function ch8bt_drop_table( $prefix ) { 
    global $wpdb;     
    $wpdb->query( 'DROP TABLE ' . $prefix . 'ch8_bug_data' );     
} 

5. Add the following code to perform the deletion of tables created to store bugs from a single or network WordPress installation:

// Check that file was called from WordPress admin 
if( !defined( 'WP_UNINSTALL_PLUGIN' ) ) {
    exit();
}
 
global $wpdb; 
 
// Check if site is configured for network installation 
if ( is_multisite() ) { 
    if ( !empty( $_GET['networkwide'] ) ) { 
        // Get blog list and cycle through all blogs 
        $start_blog = $wpdb->blogid; 
        $blog_list = $wpdb->get_col( 'SELECT blog_id FROM ' .
                                     $wpdb->blogs ); 
        foreach ( $blog_list as $blog ) { 
            switch_to_blog( $blog ); 
            // Call function to delete bug table with prefix 
            ch8bt_drop_table( $wpdb->get_blog_prefix() ); 
        } 
        switch_to_blog( $start_blog ); 
        return; 
    }     
}  
 
ch8bt_drop_table( $wpdb->prefix ); 

6. Save and close the code file.
7. Navigate to the Plugins management page and Deactivate the Chapter 8 - Bug Tracker plugin.
8. Make a copy of the entire plugin directory before performing the next step, to avoid deleting all of your work.
9. Click on the plugin's Delete link and then click OK in the dialog that asks for confirmation before deleting the plugin and its data.
10. Using phpMyAdmin, connect to your MySQL database to verify that the bug data table has been deleted.