Use the schemas below to provide the following SQL queries: course (course_id, title) prereq (course_id, prereq_id)

Rewrite the following query WITHOUT using JOIN syntax:

select c.course_id, c.title, null

from course c

where not exists

(

select * from prereq p

where c.course_id = p.course_id

)

union all

select p.course_id, null, p.prereq_id

from prereq p

where not exists

(

select *

from course c

where p.course_id = c.course_id

)