I am currently trying to run a query that will show all tables that correlate with each other. I did not make the table design. So I am running into some trouble in making: It's not clear how office_hours
table correlates with schedule
table? Overall how can I display properly all tables that correlate through a query?
SELECT *
FROM schedule
INNER JOIN semester ON schedule.semester_id = semester.id
INNER JOIN office_hours ON office_hours.id = schedule.???
I think ID
from table schedule
is only an auto_increment
column and the proper way to join schedule
from office_hours
is office_hours.schedule_id = schedule.semester_id
.
select *
from schedule
inner join semester
on schedule.semester_id = semester.id
inner join office_hours
on office_hours.schedule_id = schedule.semester_id
UPDATE 1
select *
from schedule
inner join semester
on schedule.semester_id = semester.id
inner join office_hours
on office_hours.schedule_id = schedule.semester_id
INNER JOIN faculty
ON faculty.id = office_hours.faculty_id
INNER JOIN Section
ON Section.faculty_ID = faculty.id AND
Section.Schedule_ID = Schedule.ID
INNER JOIN class
ON Class.ID = Section.Class_ID
INNER JOIN major_class_br
ON major_class_br.class_ID = Class.ID
INNER JOIN major_minor
ON major_class_br.major_minor_id = major_minor.ID
it is assumed that all ID
or linking columns exists on each table that is why INNER JOIN
was used. Otherwise, use LEFT JOIN
.
You must use the id, which is in both tables:
...
inner join office_hours on office_hours.schedule_id = schedule.id;
Tryu this:
SELECT *
FROM
SCHEDULE
INNER JOIN semester
ON schedule.semester_id = semester.id
INNER JOIN office_hours
ON office_hours.schedule_id = schedule.id
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