PCPP2 Database Access Practice Question
You are using SQLAlchemy's relationship() function. What does 'back_populates' achieve?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It synchronizes the two sides of the relationship in Python memory.
It links two sides of a relationship so that changes in one are reflected in the other via the session's identity map.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It improves query performance.
Why it's wrong here
It is for object management, not query optimization.
- ✓
It synchronizes the two sides of the relationship in Python memory.
Why this is correct
It enables bidirectional synchronization in the ORM.
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It automatically cascades deletes.
Why it's wrong here
Cascades are handled by the 'cascade' argument.
- ✗
It forces a database level foreign key constraint.
Why it's wrong here
Foreign keys are defined in the Column definition, not relationship.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP2 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP2 exam.