我需要表目录中的更新键，并编写查询（mysql查询正确）：
```
update attributes a inner join catalog c on a.parent_id = c.id set a.key = c.left_key
```
and with Laravel DB:
```
DB::table('attributes as a')
->join(catalog as c', 'a.parent_id', '=', 'c.id')
->update([ 'a.key' => 'c.left_key' ]);
```
It's right query, but DB::table ... make all key in table catalog to 0.
I write
```
DB::statement('update attributes a inner join catalog c on a.parent_id = c.id set a.key = c.left_key;');
```
它的工作！但我不明白为什么带有连接和更新的DB :: table无法正常工作