Laravel Add An Unique Index To A Table

Execute the following command to create a migration file under the database directory in a Lavarel project:
```
php artisan make:migration add_unique_index_to_tablename --table=tablename
```

In the created file, add the command to create a unique index under the function up

public function up()
    {

        Schema::table('test', function (Blueprint $table) {

            $table->unique('name'); //this will generate a key name 'test_name_unique'
            $table->unique(['field1','field2']); //compound key
            
        });
    }

and drop the index under the function

public function down()
    {
        Schema::table('test', function (Blueprint $table) {
            $table->dropUnique('test_name_unique');
        });
    }

Run the migrations using
```
php artisan migrate
```
and that’s all.