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Exam Code: DP-800

Exam Name: Developing AI-Enabled Database Solutions

Certification Provider: Microsoft

Corresponding Certification: Microsoft Certified: SQL AI Developer Associate

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Microsoft DP-800 Practice Test 22

Question 210

A SQL query needs to aggregate child invoice IDs into a JSON array per customer. Which verification finding is most specific to this scenario?

  1. The inserted rows map each JSON element into typed fields with validation.
  2. Valid samples pass and malformed strings are rejected on the target SQL version.
  3. Representative point reads and writes meet latency and locking targets.
  4. Each customer response contains a syntactically valid array with the right members.

Explanation

Correct Answer

D:

JSON array aggregation preserves JSON structure rather than emitting unsafe concatenated text. The observation “Each customer response contains a syntactically valid array with the right members” directly confirms the chosen action worked for this situation: A SQL query needs to aggregate child invoice IDs into a JSON array per customer.

Incorrect Answers

A:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. This observation would not establish that the required result occurred for A SQL query needs to aggregate child invoice IDs into a JSON array per customer. The confirming test is: Each customer response contains a syntactically valid array with the right members.

B:

Regular-expression matching expresses pattern validation more precisely than broad LIKE wildcards. This observation would not establish that the required result occurred for A SQL query needs to aggregate child invoice IDs into a JSON array per customer. The confirming test is: Each customer response contains a syntactically valid array with the right members.

C:

Rowstore B-tree indexes suit selective transactional operations better than bulk-column analytical access in this workload. This observation would not establish that the required result occurred for A SQL query needs to aggregate child invoice IDs into a JSON array per customer. The confirming test is: Each customer response contains a syntactically valid array with the right members.

Question 211

A response contract requires a JSON array of item values, not a comma-delimited string. Which approach achieves the intended result without bypassing the stated controls?

  1. Use a common table expression introduced by WITH for the statement-scoped result.
  2. Evaluate a suitable fuzzy text similarity function such as JARO_WINKLER_DISTANCE with a threshold validated on labeled examples.
  3. Use a scalar function when a single return value and performance constraints fit.
  4. Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version.

Explanation

Correct Answer

D:

JSON array aggregation preserves JSON structure rather than emitting unsafe concatenated text. For the described situation—A response contract requires a JSON array of item values, not a comma-delimited string—the targeted fix is Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version. A successful test should show: Each customer response contains a syntactically valid array with the right members.

Incorrect Answers

A:

A CTE is a named subquery scoped to a single following DML statement, not an automatic materialized table. But that technique does not solve the stated problem—A response contract requires a JSON array of item values, not a comma-delimited string. The needed intervention is Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version.

B:

Fuzzy measures quantify approximate string similarity and must not automatically authorize record merges. But that technique does not solve the stated problem—A response contract requires a JSON array of item values, not a comma-delimited string. The needed intervention is Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version.

C:

A scalar function encapsulates a single-result expression, not a full transaction workflow. But that technique does not solve the stated problem—A response contract requires a JSON array of item values, not a comma-delimited string. The needed intervention is Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version.

Question 212

A response contract requires a JSON array of item values, not a comma-delimited string. How should the team validate the selected design?

  1. Only relationships present in the graph edge table appear in query output.
  2. The sample set shows all intended token instances replaced and nonmatches preserved.
  3. Each customer response contains a syntactically valid array with the right members.
  4. Unsupported syntax is caught in a controlled environment before any production deployment.

Explanation

Correct Answer

C:

JSON array aggregation preserves JSON structure rather than emitting unsafe concatenated text. The observation “Each customer response contains a syntactically valid array with the right members” directly confirms the chosen action worked for this situation: A response contract requires a JSON array of item values, not a comma-delimited string.

Incorrect Answers

A:

MATCH expresses graph patterns over node and edge relationships in SQL graph queries. This observation would not establish that the required result occurred for A response contract requires a JSON array of item values, not a comma-delimited string. The confirming test is: Each customer response contains a syntactically valid array with the right members.

B:

REGEXP_REPLACE substitutes pattern matches and requires explicit tests for greediness and escaping. This observation would not establish that the required result occurred for A response contract requires a JSON array of item values, not a comma-delimited string. The confirming test is: Each customer response contains a syntactically valid array with the right members.

D:

AI suggestions can hallucinate features or ignore version differences; execution verification is essential. This observation would not establish that the required result occurred for A response contract requires a JSON array of item values, not a comma-delimited string. The confirming test is: Each customer response contains a syntactically valid array with the right members.

Question 213

A log stores a JSON document and a query must extract the scalar field $.device.model. What intervention should the responsible engineer choose?

  1. Use SUM(amount) OVER with PARTITION BY account and an explicit ordered window frame.
  2. Build a recursive CTE with anchor and recursive members plus a safe termination strategy.
  3. Configure and validate the approved MCP server endpoint with scoped identity and tool permissions.
  4. Use JSON_VALUE with the correct property path and appropriate type conversion.

Explanation

Correct Answer

D:

JSON_VALUE extracts scalar content; JSON_QUERY targets JSON objects or arrays. For the described situation—A log stores a JSON document and a query must extract the scalar field $.device.model—the targeted fix is Use JSON_VALUE with the correct property path and appropriate type conversion. A successful test should show: The extracted scalar matches the expected model code on sample documents.

Incorrect Answers

A:

Window aggregates calculate across partitions without reducing the number of input rows. But that technique does not solve the stated problem—A log stores a JSON document and a query must extract the scalar field $.device.model. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

B:

Recursive CTEs repeatedly apply the recursive member and require attention to cycles and MAXRECURSION. But that technique does not solve the stated problem—A log stores a JSON document and a query must extract the scalar field $.device.model. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

C:

MCP exposes tools and context; its trust, identity, and permitted actions require explicit security review. But that technique does not solve the stated problem—A log stores a JSON document and a query must extract the scalar field $.device.model. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

Question 214

A log stores a JSON document and a query must extract the scalar field $.device.model. What observable outcome proves the recommendation worked?

  1. Rows retain transaction detail and show the expected progressive totals.
  2. True matches are found in the intended array or object path while nonmatches are excluded.
  3. The extracted scalar matches the expected model code on sample documents.
  4. Concurrent requests receive nonduplicated sequence values without assuming gapless numbering.

Explanation

Correct Answer

C:

JSON_VALUE extracts scalar content; JSON_QUERY targets JSON objects or arrays. The observation “The extracted scalar matches the expected model code on sample documents” directly confirms the chosen action worked for this situation: A log stores a JSON document and a query must extract the scalar field $.device.model.

Incorrect Answers

A:

Window aggregates calculate across partitions without reducing the number of input rows. This observation would not establish that the required result occurred for A log stores a JSON document and a query must extract the scalar field $.device.model. The confirming test is: The extracted scalar matches the expected model code on sample documents.

B:

JSON membership functions compare structured content, not formatting-dependent text substrings. This observation would not establish that the required result occurred for A log stores a JSON document and a query must extract the scalar field $.device.model. The confirming test is: The extracted scalar matches the expected model code on sample documents.

D:

A sequence is an independent number generator and gaps are possible after rollbacks or caching. This observation would not establish that the required result occurred for A log stores a JSON document and a query must extract the scalar field $.device.model. The confirming test is: The extracted scalar matches the expected model code on sample documents.

Question 215

A service needs a product code inside JSON text rather than the entire matching object. Which design choice BEST addresses the root issue?

  1. Use JSON_VALUE with the correct property path and appropriate type conversion.
  2. Use supported JSON_OBJECT or FOR JSON construction for the target SQL platform.
  3. Use LAG on an explicitly ordered partition by customer or device.
  4. Configure repository-level Copilot instruction files specifying SQL conventions and approved practices.

Explanation

Correct Answer

A:

JSON_VALUE extracts scalar content; JSON_QUERY targets JSON objects or arrays. For the described situation—A service needs a product code inside JSON text rather than the entire matching object—the targeted fix is Use JSON_VALUE with the correct property path and appropriate type conversion. A successful test should show: The extracted scalar matches the expected model code on sample documents.

Incorrect Answers

B:

JSON construction functions handle quoting/escaping rather than brittle string assembly. But that technique does not solve the stated problem—A service needs a product code inside JSON text rather than the entire matching object. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

C:

LAG reads a preceding row within a partition without a self-join for each row. But that technique does not solve the stated problem—A service needs a product code inside JSON text rather than the entire matching object. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

D:

Copilot instruction files guide generated suggestions but do not enforce database permissions or accuracy. But that technique does not solve the stated problem—A service needs a product code inside JSON text rather than the entire matching object. The needed intervention is Use JSON_VALUE with the correct property path and appropriate type conversion.

Question 216

A service needs a product code inside JSON text rather than the entire matching object. Which result would provide the strongest acceptance evidence?

  1. Customers with zero invoices remain represented and counts do not spuriously include NULL child keys.
  2. The total equals the number of unique business entities independent of payment line multiplicity.
  3. One call handles all requested IDs consistently and reduces client/server round trips.
  4. The extracted scalar matches the expected model code on sample documents.

Explanation

Correct Answer

D:

JSON_VALUE extracts scalar content; JSON_QUERY targets JSON objects or arrays. The observation “The extracted scalar matches the expected model code on sample documents” directly confirms the chosen action worked for this situation: A service needs a product code inside JSON text rather than the entire matching object.

Incorrect Answers

A:

Outer joins preserve unmatched left rows; aggregate semantics require choosing COUNT expressions carefully. This observation would not establish that the required result occurred for A service needs a product code inside JSON text rather than the entire matching object. The confirming test is: The extracted scalar matches the expected model code on sample documents.

B:

Join multiplicity affects counts and sums; choose grain-aware aggregation before interpreting totals. This observation would not establish that the required result occurred for A service needs a product code inside JSON text rather than the entire matching object. The confirming test is: The extracted scalar matches the expected model code on sample documents.

C:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. This observation would not establish that the required result occurred for A service needs a product code inside JSON text rather than the entire matching object. The confirming test is: The extracted scalar matches the expected model code on sample documents.

Question 217

An API posts a JSON array of order lines that must become relational rows. What should the database team change FIRST for this workload?

  1. Use a common table expression introduced by WITH for the statement-scoped result.
  2. Use a supported SQL graph MATCH expression across declared node and edge aliases.
  3. Use OPENJSON with a typed WITH schema to shred the array into columns.
  4. Validate generated SQL against actual engine version, feature availability, and representative tests.

Explanation

Correct Answer

C:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. For the described situation—An API posts a JSON array of order lines that must become relational rows—the targeted fix is Use OPENJSON with a typed WITH schema to shred the array into columns. A successful test should show: The inserted rows map each JSON element into typed fields with validation.

Incorrect Answers

A:

A CTE is a named subquery scoped to a single following DML statement, not an automatic materialized table. But that technique does not solve the stated problem—An API posts a JSON array of order lines that must become relational rows. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

B:

MATCH expresses graph patterns over node and edge relationships in SQL graph queries. But that technique does not solve the stated problem—An API posts a JSON array of order lines that must become relational rows. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

D:

AI suggestions can hallucinate features or ignore version differences; execution verification is essential. But that technique does not solve the stated problem—An API posts a JSON array of order lines that must become relational rows. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

Question 218

An API posts a JSON array of order lines that must become relational rows. Which acceptance check should accompany the remediation?

  1. The inserted rows map each JSON element into typed fields with validation.
  2. Valid nonmatching rows remain while genuinely matching identifiers are excluded.
  3. The score distinguishes one-character edits from unrelated strings under reference tests.
  4. Unit tests confirm one value per supported argument combination without hidden mutations.

Explanation

Correct Answer

A:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. The observation “The inserted rows map each JSON element into typed fields with validation” directly confirms the chosen action worked for this situation: An API posts a JSON array of order lines that must become relational rows.

Incorrect Answers

B:

NOT IN with unknown NULL comparison can filter unexpectedly; NOT EXISTS tests matching row presence. This observation would not establish that the required result occurred for An API posts a JSON array of order lines that must become relational rows. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

C:

Edit distance is a count-like difference measure, not a proof that two records are the same entity. This observation would not establish that the required result occurred for An API posts a JSON array of order lines that must become relational rows. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

D:

A scalar function encapsulates a single-result expression, not a full transaction workflow. This observation would not establish that the required result occurred for An API posts a JSON array of order lines that must become relational rows. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

Question 219

A bulk ingest accepts structured nested JSON and needs one SQL row per element. Which implementation most directly satisfies the stated requirement?

  1. Use OPENJSON with a typed WITH schema to shred the array into columns.
  2. Use explicit TRY...CATCH with transaction control and THROW or XACT_STATE-aware rollback.
  3. Use supported JSON_ARRAYAGG or an equivalent validated JSON aggregation mechanism for that SQL version.
  4. Use an INSTEAD OF trigger where supported to implement the intended view-write translation.

Explanation

Correct Answer

A:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. For the described situation—A bulk ingest accepts structured nested JSON and needs one SQL row per element—the targeted fix is Use OPENJSON with a typed WITH schema to shred the array into columns. A successful test should show: The inserted rows map each JSON element into typed fields with validation.

Incorrect Answers

B:

Error handling and atomic transactions prevent partial multi-step business operations. But that technique does not solve the stated problem—A bulk ingest accepts structured nested JSON and needs one SQL row per element. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

C:

JSON array aggregation preserves JSON structure rather than emitting unsafe concatenated text. But that technique does not solve the stated problem—A bulk ingest accepts structured nested JSON and needs one SQL row per element. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

D:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. But that technique does not solve the stated problem—A bulk ingest accepts structured nested JSON and needs one SQL row per element. The needed intervention is Use OPENJSON with a typed WITH schema to shred the array into columns.

Question 220

A bulk ingest accepts structured nested JSON and needs one SQL row per element. What measurement or test best demonstrates that the requirement is satisfied?

  1. Valid samples pass and malformed strings are rejected on the target SQL version.
  2. Known spelling variations rank closely but unrelated names remain below the review threshold.
  3. The inserted rows map each JSON element into typed fields with validation.
  4. Historical queries can distinguish transaction history from independently entered business-effective intervals.

Explanation

Correct Answer

C:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. The observation “The inserted rows map each JSON element into typed fields with validation” directly confirms the chosen action worked for this situation: A bulk ingest accepts structured nested JSON and needs one SQL row per element.

Incorrect Answers

A:

Regular-expression matching expresses pattern validation more precisely than broad LIKE wildcards. This observation would not establish that the required result occurred for A bulk ingest accepts structured nested JSON and needs one SQL row per element. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

B:

Fuzzy measures quantify approximate string similarity and must not automatically authorize record merges. This observation would not establish that the required result occurred for A bulk ingest accepts structured nested JSON and needs one SQL row per element. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

D:

System time records database validity, not necessarily application-defined effective time. This observation would not establish that the required result occurred for A bulk ingest accepts structured nested JSON and needs one SQL row per element. The confirming test is: The inserted rows map each JSON element into typed fields with validation.

Developing AI-Enabled Database Solutions (DP-800) Practice Tests