Check if column exists for one table in DB

I found this solution : here

So…

class MainClassAddon{

     public function __construct(){
         register_activation_hook( __FILE__, array( $this, 'install' ) );
     }

     public function install(){

         $row = $wpdb->get_results(  "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name="wp_t" AND column_name="c""  );

         if(empty($row)){
             $wpdb->query("ALTER TABLE wp_t ADD c INT(1) NOT NULL DEFAULT 1");
         }
     }
}
new MainClassAddon();
register_uninstall_hook( __FILE__,  array( 'PluginNamespace\MainClassAddon', 'uninstall' ) );