unique laravel migration

1Schema::table('tableName', function($table)
2{
3    $table->string('column-name')->unique(); //notice the parenthesis I added
4});

1To rollback one step:
2
3php artisan migrate:rollback
4
5To rollback multiple steps:
6
7php artisan migrate:rollback --step=[x]
8  
9To drop all tables and reload all migrations:
10
11php artisan migrate:fresh

1$table->dropUnique('users_email_unique');

1Schema::table('manufacturers', function($table)
2{
3    $table->string('name')->unique(); 
4});
5

1use Illuminate\Database\Schema\Blueprint;
2use Illuminate\Support\Facades\Schema;
3
4Schema::table('users', function (Blueprint $table) {
5    $table->string('email')->unique();
6});