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I suspect you might have more success if your replaced your open and close double quotes (i.e. “ and ”) by standard double quotes (").
This is the forum for the SQL Developer Data Modeler product. You're more likely to get an answer to this sort of question if you post on the SQL and PL/SQL forum: https://forums.oracle.com/forums/forum.jspa?forumID=75
SELECT j.job_title "Job Title", l.city "Location", e.employee_id "Employees ID", COUNT (*) "No of Employees" FROM hr.jobs j, hr.locations l, hr.employees e;