In my application, a user can be identified by one of three fields - an nickname, a phone number or mail. None of the fields are required, but at least one must be completed. I am trying to make a check, which requires filling one of the three fields. In SQL, I would write something like this: ...sql CONSTRAINT username_email_phone_number_notnull CHECK ( NOT (nickname IS NULL and email IS NULL and phone_number IS NULL) ) ``` How to write such a restriction in sequel?
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