This DP-203 practice question tests your understanding of develop data processing. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Refer to the exhibit. You are creating a serverless SQL table in Azure Synapse Analytics that reads Parquet files from the specified location. The folder contains multiple Parquet files with different schemas. When querying the table, you get an error about schema mismatch. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The serverless SQL pool infers schema from the first file and expects all files to have the same schema.
Option C is correct because Azure Synapse serverless SQL pools infer the schema from the first Parquet file encountered in the specified location. When multiple Parquet files with different schemas exist, the pool expects all subsequent files to match that initial schema. If any file has a different schema (e.g., different column names, data types, or number of columns), a schema mismatch error is raised. This behavior is by design, as serverless SQL does not merge or reconcile disparate schemas across files.
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.
✗
The Parquet files are not using the .parquet extension.
Why it's wrong here
The extension is not shown; but if they are Parquet, the extension is not required for inference.
✗
The derivedModel option is set to false, which disables schema inference.
Why it's wrong here
derivedModel=false means no model is used; schema is still inferred from files.
✓
The serverless SQL pool infers schema from the first file and expects all files to have the same schema.
Why this is correct
Serverless SQL uses schema inference from the first file; subsequent files with different schemas cause errors.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The recursive option is causing the table to include files from subfolders that have different schemas.
Why it's wrong here
Recursive only includes subfolders; schema inference still uses the first file.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume serverless SQL can automatically handle heterogeneous schemas (like Spark does with mergeSchema), but in reality it requires all files to share the exact same schema as the first file it reads.
Trap categories for this question
Command / output trap
The extension is not shown; but if they are Parquet, the extension is not required for inference.
Detailed technical explanation
How to think about this question
Under the hood, the serverless SQL pool uses an OPENROWSET with the PARSER_VERSION='2.0' to read Parquet metadata. It reads the schema from the first file's footer, which contains the Parquet schema definition. If subsequent files have a different number of columns or column types, the query fails with a 'Schema mismatch detected' error. In real-world scenarios, this often happens when data pipelines append files with evolving schemas (e.g., new columns added over time) without ensuring schema consistency across all files in the same folder.
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.
Quick reference
Cloud Service Model Comparison
Model
You Manage
Provider Manages
Examples
IaaS
OS, runtime, apps, data
Hardware, hypervisor, networking
EC2, Azure VMs, GCP Compute Engine
PaaS
Apps and data
OS, runtime, middleware, hardware
Elastic Beanstalk, Azure App Service
SaaS
Data and settings only
Everything else
Microsoft 365, Salesforce, Workday
FaaS / Serverless
Function code only
Infra, scaling, runtime
Lambda, Azure Functions, Cloud Run
CaaS
Containers and apps
Kubernetes, OS, hardware
EKS, AKS, GKE
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Develop data processing — This question tests Develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The serverless SQL pool infers schema from the first file and expects all files to have the same schema. — Option C is correct because Azure Synapse serverless SQL pools infer the schema from the first Parquet file encountered in the specified location. When multiple Parquet files with different schemas exist, the pool expects all subsequent files to match that initial schema. If any file has a different schema (e.g., different column names, data types, or number of columns), a schema mismatch error is raised. This behavior is by design, as serverless SQL does not merge or reconcile disparate schemas across files.
What should I do if I get this DP-203 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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