How are relationships between the 'Teacher' and 'Student' tables implemented in a relational database?
sobes.tech AI
Answer from AI
In a relational database, the relationships between the tables "Teacher" and "Student" are usually implemented through foreign keys that reflect the type of connection between them:
-
One-to-many (1:N) relationship — if one teacher teaches many students. A column with a foreign key referencing the primary key of the "Teacher" table is added to the "Student" table.
-
Many-to-many (M:N) relationship — if students can have multiple teachers, and teachers can have multiple students. In this case, an additional junction table, for example, "Teacher_Student," is created, which contains pairs of teacher and student identifiers.
Example tables for a 1:N relationship:
| Teacher |
|---|
| Id (PK) |
| Name |
| Student |
|---|
| Id (PK) |
| Name |
| TeacherId (FK) |
This is how relationships are implemented and data integrity is maintained.