| id | country | capitol |
| 1 | USA | Washington DC |
| 2 | Japan | Tokyo |
| 3 | United Kingdom | London |
And you want to fetch data like this:
['Washington DC', 'Tokyo', 'London']
Then do this:
$capitols = $this->countries
->find()
->extract('capitol')
->toArray();
And you want to fetch data like this:
Then do this:
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