At least one X but no Ys Query

Question

I come across this pattern occasionally and I haven\'t found a terribly satisfactory way to solve it.

Say I have a employee table and an review

Answer 1

SELECT ???? FROM employee,review
WHERE employees.id = review.id
GROUP BY employees.id
HAVING SUM(IF(review='good',1,0)) > 1 AND SUM(IF(review='bad',1,0)) = 0