Final answer:
Referential Integrity Constraint in Database Management
Step-by-step explanation:
The subject of this question is Database Management in the field of Computer and Technology. The concept being described is Referential Integrity Constraint.
In a database, a referential integrity constraint specifies that for every attribute value in one relation that has been specified in order to allow reference to another relation, the tuple being referenced must remain intact. This means that if one relation has a foreign key that references another relation, the value of the foreign key must match a value in the referenced relation's primary key.
If any updates or deletions are performed on the referenced relation, it should not result in invalid references in the referring relation.
For example, let's say we have two tables - Students and Courses. The Students table has a foreign key course_id that references the course_id primary key in the Courses table. If a student is enrolled in a course with a specific course_id, that course_id must exist in the Courses table.
If a course is deleted from the Courses table, any students enrolled in that course should either be removed or their course_id should be set to null, depending on the business rules.