请问添加 phone 字段报错是什么原因
Illuminate\Database\QueryException : SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'users_phone_unique' (SQL: alter table `users` add unique `users_phone_unique`(`phone`))
at /home/vagrant/code/larabbs/vendor/laravel/framework/src/Illuminate/Database/Connection.php:664
660| // If an exception occurs when attempting to run a query, we'll format the error
661| // message to include the bindings with SQL, which will make this exception a
662| // lot more helpful to the developer instead of just the database's errors.
663| catch (Exception $e) {
> 664| throw new QueryException(
665| $query, $this->prepareBindings($bindings), $e
666| );
667| }
668|
Exception trace:
1 Doctrine\DBAL\Driver\PDOException::("SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'users_phone_unique'")
/home/vagrant/code/larabbs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:119
2 PDOException::("SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'users_phone_unique'")
/home/vagrant/code/larabbs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:117
Please use the argument -v to see more details.
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