Answers for "sql to migration laravel"

laravel migration remove column

public function up()
{
  Schema::table('table', function($table) {
    $table->dropColumn('column_name');
  });
}

migrations required field laravel

$table->string('foo')->nullable(false)->change();

Laravel Migrations from an existing database

To Generate Laravel Migrations from an existing database.
  
Use the following package.
  
https://github.com/Xethron/migrations-generator