When executing the query with adding the FULL JOIN with where clause like below -

SELECT Professor.Id AS [Professor.Id], Professor.ProfessorName,

CASE Professor.HasTenure WHEN 1 THEN 'True' WHEN 0 THEN 'False' ELSE NULL END AS [Has Tenure],

Class.ProfessorId AS [Class.ProfessorId], Class.ClassName,

Class.ClassYear, Class.ClassSemester

FROM Professor

FULL JOIN Class

ON Professor.Id = Class.ProfessorId AND Class.ClassYear >= 2011

WHERE Professor.HasTenure = 'True'

Then it is giving same results as adding LEFT OUTER JOIN.