laravel migration index

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

1// To drop a column, use the dropColumn method on the schema builder.
2// Before dropping columns from a SQLite database, you will need to add
3// the doctrine/dbal dependency to your composer.json file and run the
4// composer update command in your terminal to install the library:
5
6Schema::table('users', function (Blueprint $table) {
7    $table->dropColumn('votes');
8});

1$table->index(['account_id', 'created_at']);

1<?php
2
3use Illuminate\Database\Migrations\Migration;
4use Illuminate\Database\Schema\Blueprint;
5use Illuminate\Support\Facades\Schema;
6use Illuminate\Support\Facades\DB;
7
8class Products extends Migration
9{
10    /**
11     * Run the migrations.
12     *
13     * @return void
14     */
15    public function up()
16    {
17        Schema::create('products', function (Blueprint $table) {
18            $table->id();
19            $table->string('product_name')->index('product_name');
20            $table->string('product_sku')->index('product_sku');
21        });
22    }
23
24    /**
25     * Reverse the migrations.
26     *
27     * @return void
28     */
29    public function down()
30    {
31        Schema::dropIfExists('products');
32    }
33}

1$table->string('name', 100);