Why can't I SELECT a parent field that doesn't have a child?

(rest_branches) is the table of restaurants.

(phone_numbers) is another table which contains the restaurants phone_numbers, and it has a field called (branc开发者_JS百科h_id) which references the restaurant id.

When I try:

SELECT * 
FROM rest_branches
NATURAL JOIN phone_numbers

I only get the restaurants which have a phone_number. What should I do to get all restaurants even if they don't have a phone number?

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Because that's how INNER/NATURAL joins work. If you wanted to get all restaurants, use a LEFT JOIN instead and specify the join condition.