- A
Continue using inheritance as Cloud SQL supports it fully
Why wrong: Cloud SQL for PostgreSQL does not fully support table inheritance.
- B
Use PostgreSQL foreign data wrappers to emulate inheritance
Why wrong: FDWs add latency and complexity, not a direct replacement.
- C
Use materialized views to combine data
Why wrong: Materialized views are read-only and do not support inserts/updates.
- D
Redesign the schema using separate tables with joins
Standard approach; can use views to simulate inheritance for read operations.
Question 472 of 1,000
Replacing Table Inheritance in Cloud SQL PostgreSQL Migration
This PCDE practice question tests your understanding of design and implement database schemas. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your team is migrating an on-premises PostgreSQL database to Cloud SQL for PostgreSQL. The current schema uses table inheritance, which is not fully supported in Cloud SQL. What should you do to minimize application changes?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Quick Answer
The answer is to redesign the schema using separate tables with joins. This is the correct approach because Cloud SQL for PostgreSQL does not fully support PostgreSQL table inheritance, meaning inherited child tables lose their automatic column sharing and constraint propagation. By breaking the inheritance hierarchy into individual tables and using JOINs in queries, you preserve the relational structure while ensuring full compatibility with Cloud SQL. On the Google Professional Cloud Database Engineer exam, this scenario tests your ability to adapt on-premises PostgreSQL features to managed services, often appearing as a migration planning question. A common trap is choosing foreign data wrappers or materialized views, but the former adds unnecessary complexity and the latter blocks writes. The key is to create views that emulate the original inheritance hierarchy, minimizing application code changes. Memory tip: think “Inheritance breaks, JOINs and views take its place.”
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
✓
Redesign the schema using separate tables with joins
Cloud SQL for PostgreSQL does not support table inheritance, a PostgreSQL-specific feature that allows child tables to inherit columns from a parent table. Option D is correct because redesigning the schema using separate tables with joins is the standard relational approach that works across all PostgreSQL deployments, including Cloud SQL, and minimizes application changes by preserving the logical data model.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Continue using inheritance as Cloud SQL supports it fully
Why it's wrong here
Cloud SQL for PostgreSQL does not fully support table inheritance.
- ✗
Use PostgreSQL foreign data wrappers to emulate inheritance
Why it's wrong here
FDWs add latency and complexity, not a direct replacement.
- ✗
Use materialized views to combine data
Why it's wrong here
Materialized views are read-only and do not support inserts/updates.
- ✓
Redesign the schema using separate tables with joins
Why this is correct
Standard approach; can use views to simulate inheritance for read operations.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google often tests the misconception that Cloud SQL for PostgreSQL is a fully compatible drop-in replacement for on-premises PostgreSQL, but table inheritance is a notable exception that requires schema redesign.
Detailed technical explanation
How to think about this question
Table inheritance in PostgreSQL uses the `INHERITS` clause to create a parent-child relationship where child tables automatically include all columns of the parent. Cloud SQL omits this feature because it relies on shared storage and partitioning mechanisms that are incompatible with the inheritance model. In practice, redesigning with separate tables and explicit JOINs ensures full compatibility with Cloud SQL's managed environment while maintaining data integrity through foreign key constraints.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCDE question test?
Design and implement database schemas — This question tests Design and implement database schemas — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Redesign the schema using separate tables with joins — Cloud SQL for PostgreSQL does not support table inheritance, a PostgreSQL-specific feature that allows child tables to inherit columns from a parent table. Option D is correct because redesigning the schema using separate tables with joins is the standard relational approach that works across all PostgreSQL deployments, including Cloud SQL, and minimizes application changes by preserving the logical data model.
What should I do if I get this PCDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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