The correct answer is that you can query the external table using standard T-SQL SELECT statements. This is because an external table in Azure Synapse dedicated SQL pool is a read-only abstraction over data stored in Azure Blob Storage or Azure Data Lake Store, and it leverages PolyBase to allow direct querying without importing data into the pool. PolyBase can push down predicate filtering to the external source, reading only the required data for efficient query execution. On the Microsoft Azure Data Engineer Associate DP-203 exam, this concept tests your understanding of how external tables differ from regular tables—specifically that they support only SELECT operations, not INSERT, UPDATE, or DELETE. A common trap is assuming you need to load data first or that external tables support write operations. Remember the memory tip: "External equals SELECT only—PolyBase reads, never writes."
DP-203 Design and implement data storage Practice Question
This DP-203 practice question tests your understanding of design and implement data storage. 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.
Exhibit
Refer to the exhibit.
```sql
CREATE EXTERNAL DATA SOURCE MyDataSource
WITH (
LOCATION = 'abfss://data@storagedatalake.dfs.core.windows.net',
TYPE = HADOOP,
CREDENTIAL = MyCredential
);
CREATE EXTERNAL FILE FORMAT MyFileFormat
WITH (
FORMAT_TYPE = PARQUET,
DATA_COMPRESSION = 'org.apache.hadoop.io.compress.SnappyCodec'
);
CREATE EXTERNAL TABLE dbo.Orders (
OrderID INT,
CustomerID INT,
OrderDate DATE,
TotalAmount DECIMAL(10,2)
)
WITH (
LOCATION = '/orders/',
DATA_SOURCE = MyDataSource,
FILE_FORMAT = MyFileFormat
);
```
You are an administrator for an Azure Synapse Analytics dedicated SQL pool. You execute the T-SQL statements shown in the exhibit. The external table 'dbo.Orders' is created. Which statement about querying this external table is true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
You can query the external table using standard T-SQL SELECT statements.
Option C is correct because an external table in Azure Synapse Analytics dedicated SQL pool is a read-only abstraction over data stored externally (e.g., in Azure Blob Storage or Azure Data Lake Store). You can query it directly using standard T-SQL SELECT statements without importing data into the pool, leveraging PolyBase to push down predicate filtering and read only the required data.
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.
✗
Querying the external table automatically imports data into a round-robin distribution.
Why it's wrong here
No automatic import.
✗
The table cannot be queried until the data is imported into the dedicated SQL pool.
Why it's wrong here
External tables are queryable without importing.
✓
You can query the external table using standard T-SQL SELECT statements.
Why this is correct
External tables support SELECT queries.
Related concept
Read the scenario before looking for a memorised answer.
✗
You must first create a PolyBase external table before querying.
Why it's wrong here
It already is a PolyBase external table.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume external tables require an explicit import step before querying, but in reality, PolyBase allows direct querying of external data without any data movement into the dedicated SQL pool.
Detailed technical explanation
How to think about this question
Under the hood, PolyBase uses the external data source to connect to Azure Blob Storage or Azure Data Lake Store via the abfss:// or wasbs:// protocol, and the external file format defines the serialization (e.g., CSV, Parquet). When you query the external table, PolyBase reads the files in parallel, applies predicate pushdown for formats like Parquet, and returns results without moving data into the SQL pool, which is ideal for ELT patterns where you stage data externally before transforming it.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: You can query the external table using standard T-SQL SELECT statements. — Option C is correct because an external table in Azure Synapse Analytics dedicated SQL pool is a read-only abstraction over data stored externally (e.g., in Azure Blob Storage or Azure Data Lake Store). You can query it directly using standard T-SQL SELECT statements without importing data into the pool, leveraging PolyBase to push down predicate filtering and read only the required data.
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.
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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