Question

What are the types of relationships in a non-spatial join, and what is an example?

a) One-to-many, many-to-one, many-to-many; Example: Student-Teacher relationship
b) Spatial, temporal, attribute; Example: Road network analysis
c) Inner join, outer join, left join; Example: Database query
d) Union, intersection, difference; Example: Geometric operations on shapes

Answer 1

In a non-spatial join, there can be one-to-many, many-to-one, and many-to-many relationships. For example, in a student-course relationship, one student can be enrolled in multiple courses and one course can have multiple students.

Step-by-step explanation:

In a non-spatial join, there are several types of relationships that can exist:

1. One-to-many: This is when one record in one table is related to multiple records in another table. For example, a customer can have multiple orders.
2. Many-to-one: This is the opposite of a one-to-many relationship, where multiple records in one table are related to one record in another table. For example, multiple students can be assigned to one teacher.
3. Many-to-many: This is when multiple records in one table are related to multiple records in another table. For example, students can have multiple courses, and courses can have multiple students.

An example of a non-spatial join with these types of relationships could be a student-course relationship where one student can be enrolled in multiple courses, and one course can have multiple students.