Oh I understand what the author is doing and it's a good article.

But when it takes a less time, is probably more efficient and in my opinion is easier to...

Surely the following is an easier way to accomplish this...

SELECT PR.id, PR.ProfessorName, ClassName, ClassYear, ClassSemester

FROM Professor PR

LEFT JOIN

(

SELECT ProfessorID, ClassName, ClassYear, ClassSemester

FROM Class

WHERE ClassYear>=2011

...

wouldn't it be easier just to set the value of a Field when the 1st job is running...then your 2nd job could just read the value and run/not run depending...