SELECT P.First Name, P. Last Name
FROM Persons AS P
LEFT OUTER JOIN Vaccinations AS V ON P. Email = V.Recipient
WHERE V.Comments IS NULL;
Select the correct answer:
a) No rows will be returned
b) A row for each vaccination of persons who never had any comments associated with their vaccinations.
c) A row for each vaccination without comments of persons who were vaccinated, and a row for each person who was not.
d) A row for each person who never had any comments.