laravel 8 migration unique to non unique code example

Example 1: laravel migration rollback

To rollback one step:

php artisan migrate:rollback

To rollback multiple steps:

php artisan migrate:rollback --step=[x]
  
To drop all tables and reload all migrations:

php artisan migrate:fresh

Example 2: laravel migration add unique column

Schema::table('tableName', function($table)
{
    $table->string('column-name')->unique(); //notice the parenthesis I added
});