Database – Make sure that the room number of a course section with a certain restriction is within the permitted rooms for this course

In the following situation, I have difficulty making restrictions. This is a hypothetical scenario for practicing the DB design.

Imagine a rule in a school that says `Courses` some are taken firmly `Rooms`, e.g: Mathematics course can only be taken in rooms 101, 102 and 110 `Course` can have many `Sections`, So I have to make sure none `Section` of Mathematics course is only taken in the specified `Rooms`,

Now I'm doing one `Course-Room` Take relationship through the PK of both `Course` and `Room`, The `Section` The relation is created by the PK of `Course` and adding the `Section` Number with it.

For storing the `Rooms` of `Sections`, a relation `Section-Room` created. The `Section-Room` The table should only contain rows that match that `Course-Room` Relationship. How can I limit this from that relationship `Course-Room` Relationship?

A sample ERD is created here: https://dbdiagram.io/d/5e4433459e76504e0ef15e24

The schema as DBML is subsequently inserted as a backup.

``````// Store info about a Course
Table course {
course_pk int (pk)
course_code varchar(13) (not null, unique)
course_name varchar(200) (not null)
}

Table room {
room_pk int (pk)
room_no int
}

Table section {
section_pk int (pk)
course_id int
section int
}
Ref: section.course_id > course.course_pk

Table course_room {
course_room_pk int (pk)
course_id int
room_id int
}
Ref: course_room.course_id > course.course_pk
Ref: course_room.room_id > room.room_pk
``````

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Is it ever a good idea to list a Python section so that you get the index twice?

Sorry for the strange title, but I couldn't think of a better way to explain it. I saw this from someone once and didn't think it was a good idea, but I wanted to check it out. Basically, he wanted to return the numbers 0-3 and do two different things with it. Suppose he wanted to use one as a key for a dictionary and the other for a value calculation:

``````d{0:0, 1:1, 2:4, 3:9}
``````

So he did this to return the index twice:

``````d = {}
for i, v in enumerate(range(4)):
d(i) = v**2
``````

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To let $$E rightarrow N$$ be a vector bundle, $$M$$ a varied and let $$varphi: E rightarrow M$$ be a smooth card. Let us assume that we have along the zero section
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