how to laravel migration alter table code example

Example 1: migration rollback

php artisan migrate:rollback

Example 2: laravel add column to table

// The table method on the Schema facade MAY BE USED TO UPDATE EXISTING TABLES.
// The table method accepts two arguments: the name of the table and a Closure
// that receives a Blueprint instance you may use to add columns to the table:
Schema::table('users', function (Blueprint $table) {
    $table->string('email');
});