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DP-800 Questions & Answers
Exam Code: DP-800
Exam Name: Developing AI-Enabled Database Solutions
Certification Provider: Microsoft
DP-800 Premium File
101 Questions & Answers
Last Update: Nov 12, 2026
Includes questions types found on actual exam such as drag and drop, simulation, type in, and fill in the blank.
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DP-800 Questions & Answers
Exam Code: DP-800
Exam Name: Developing AI-Enabled Database Solutions
Certification Provider: Microsoft
DP-800 Premium File
101 Questions & Answers
Last Update: Nov 12, 2026
Includes questions types found on actual exam such as drag and drop, simulation, type in, and fill in the blank.
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Developing AI-Enabled Database Solutions DP-800 Practice Test 44

Question 430

The security and data engineering reviewers accept this action: Use named nonrecursive CTEs to structure the intermediate relational expressions. Given that a complex query repeats the same filtered sales subquery in three downstream aggregations and needs readable decomposition. Which technical principle most directly explains why it works?

  1. MATCH relates graph nodes through declared edge patterns
  2. CTEs define query-scoped named result expressions, improving composability and clarity
  3. EXISTS tests whether a related row exists, without joining or repeating the parent
  4. Regular-expression replacement transforms matched substrings according to the pattern

Explanation

Correct Answer

B:

CTEs define query-scoped named result expressions, improving composability and clarity. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: the rewritten query returns identical aggregates and has a readable execution plan.

Incorrect Answers

A:

MATCH relates graph nodes through declared edge patterns. That principle is applicable when a SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. It does not explain the selected change in the current case, which depends on cTEs define query-scoped named result expressions, improving composability and clarity.

C:

EXISTS tests whether a related row exists, without joining or repeating the parent. That principle is applicable when a report must include only customers who have at least one unpaid invoice without multiplying customer rows. It does not explain the selected change in the current case, which depends on cTEs define query-scoped named result expressions, improving composability and clarity.

D:

Regular-expression replacement transforms matched substrings according to the pattern. That principle is applicable when a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements. It does not explain the selected change in the current case, which depends on cTEs define query-scoped named result expressions, improving composability and clarity.

Question 431

An incident post-change check is required for this fix: Use named nonrecursive CTEs to structure the intermediate relational expressions. The check must catch this potential failure: A CTE by itself does not guarantee materialization or caching. Which observed outcome demonstrates the desired behavior?

  1. The first event has no prior value and later readings show the correct delta
  2. Invoice rows remain present and their running totals increase in the intended order
  3. The rewritten query returns identical aggregates and has a readable execution plan
  4. Valid identifiers pass and malformed identifiers fail the sample test suite

Explanation

Correct Answer

C:

The rewritten query returns identical aggregates and has a readable execution plan. This is the direct acceptance criterion because cTEs define query-scoped named result expressions, improving composability and clarity. The validation should also distinguish the failure condition: a CTE by itself does not guarantee materialization or caching.

Incorrect Answers

A:

The first event has no prior value and later readings show the correct delta. That observation would validate a different requirement: an anomaly report should compare each machine's current reading to its immediately preceding reading in time. Here the required evidence is the rewritten query returns identical aggregates and has a readable execution plan.

B:

Invoice rows remain present and their running totals increase in the intended order. That observation would validate a different requirement: a billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows. Here the required evidence is the rewritten query returns identical aggregates and has a readable execution plan.

D:

Valid identifiers pass and malformed identifiers fail the sample test suite. That observation would validate a different requirement: a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Here the required evidence is the rewritten query returns identical aggregates and has a readable execution plan.

Question 432

The operational test fails because: A CTE by itself does not guarantee materialization or caching. The actual requirement is: A complex query repeats the same filtered sales subquery in three downstream aggregations and needs readable decomposition. Which corrective implementation addresses the cause?

  1. Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one
  2. Use JSON_QUERY with the appropriate path to return the nested JSON fragment
  3. Inspect XACT_STATE in CATCH and roll back an uncommittable transaction
  4. Use named nonrecursive CTEs to structure the intermediate relational expressions

Explanation

Correct Answer

D:

Use named nonrecursive CTEs to structure the intermediate relational expressions. CTEs define query-scoped named result expressions, improving composability and clarity. This directly corrects the observed failure, and success can be checked because the rewritten query returns identical aggregates and has a readable execution plan.

Incorrect Answers

A:

ROW_NUMBER returns one winner per partition when a deterministic ordering is provided. Although relevant to an event ingestion table receives multiple versions for a natural key and must retain the latest ingestion timestamp deterministically, this action would not correct the recorded production failure: a CTE by itself does not guarantee materialization or caching. Use the target remedy instead.

B:

JSON_QUERY returns an object or array fragment rather than the scalar extracted by JSON_VALUE. Although relevant to a SQL API must extract a nested JSON array of product attributes from each payload while preserving it as valid JSON, not a quoted scalar string, this action would not correct the recorded production failure: a CTE by itself does not guarantee materialization or caching. Use the target remedy instead.

C:

XACT_STATE distinguishes active committable and uncommittable transaction states. Although relevant to a stored procedure catches a transaction error and must decide whether the transaction is committable before cleanup, this action would not correct the recorded production failure: a CTE by itself does not guarantee materialization or caching. Use the target remedy instead.

Question 433

A cross-functional engineering review records the following need: An event ingestion table receives multiple versions for a natural key and must retain the latest ingestion timestamp deterministically. Which implementation best satisfies this requirement?

  1. Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one
  2. Use a recursive common table expression with an anchor, recursive member and termination condition
  3. Use supported JSON_OBJECT construction with named properties
  4. Use a correlated EXISTS predicate against unpaid invoices

Explanation

Correct Answer

A:

ROW_NUMBER returns one winner per partition when a deterministic ordering is provided. For this stated production need, the recommended implementation is: Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one. Evidence to look for: one row per key remains and equal-timestamp ties resolve repeatably.

Incorrect Answers

B:

Recursive CTEs iteratively expand related rows until no further matches exist. That method solves a different requirement: a report must navigate organizational parent-child relationships of unknown depth stored as EmployeeId and ManagerId. The current case instead requires use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one.

C:

Native JSON constructors handle escaping and represent values structurally. That method solves a different requirement: a SQL API needs to return one structured JSON object per customer instead of manually building a quoted string. The current case instead requires use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one.

D:

EXISTS tests whether a related row exists, without joining or repeating the parent. That method solves a different requirement: a report must include only customers who have at least one unpaid invoice without multiplying customer rows. The current case instead requires use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one.

Question 434

The database team applies the following decision: Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one. Given that an event ingestion table receives multiple versions for a natural key and must retain the latest ingestion timestamp deterministically. Which technical principle most directly explains why it works?

  1. Regular-expression replacement transforms matched substrings according to the pattern
  2. ROW_NUMBER returns one winner per partition when a deterministic ordering is provided
  3. CTEs define query-scoped named result expressions, improving composability and clarity
  4. A correlated expression binds outer-row values to its subquery evaluation

Explanation

Correct Answer

B:

ROW_NUMBER returns one winner per partition when a deterministic ordering is provided. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: one row per key remains and equal-timestamp ties resolve repeatably.

Incorrect Answers

A:

Regular-expression replacement transforms matched substrings according to the pattern. That principle is applicable when a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements. It does not explain the selected change in the current case, which depends on rOW_NUMBER returns one winner per partition when a deterministic ordering is provided.

C:

CTEs define query-scoped named result expressions, improving composability and clarity. That principle is applicable when a complex query repeats the same filtered sales subquery in three downstream aggregations and needs readable decomposition. It does not explain the selected change in the current case, which depends on rOW_NUMBER returns one winner per partition when a deterministic ordering is provided.

D:

A correlated expression binds outer-row values to its subquery evaluation. That principle is applicable when an invoice query must return clients whose most recent payment date is later than their own contract start date. It does not explain the selected change in the current case, which depends on rOW_NUMBER returns one winner per partition when a deterministic ordering is provided.

Question 435

The deployment validation team is assessing this proposal: Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one. The check must catch this potential failure: Using MAX timestamp alone can return multiple rows for tied timestamps. Which observed outcome demonstrates the desired behavior?

  1. Valid identifiers pass and malformed identifiers fail the sample test suite
  2. The graph query returns connected accounts matching the requested relation
  3. One row per key remains and equal-timestamp ties resolve repeatably
  4. An induced error leaves no half-committed changes and the original error is surfaced

Explanation

Correct Answer

C:

One row per key remains and equal-timestamp ties resolve repeatably. This is the direct acceptance criterion because rOW_NUMBER returns one winner per partition when a deterministic ordering is provided. The validation should also distinguish the failure condition: using MAX timestamp alone can return multiple rows for tied timestamps.

Incorrect Answers

A:

Valid identifiers pass and malformed identifiers fail the sample test suite. That observation would validate a different requirement: a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Here the required evidence is one row per key remains and equal-timestamp ties resolve repeatably.

B:

The graph query returns connected accounts matching the requested relation. That observation would validate a different requirement: a SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. Here the required evidence is one row per key remains and equal-timestamp ties resolve repeatably.

D:

An induced error leaves no half-committed changes and the original error is surfaced. That observation would validate a different requirement: a stored procedure catches a transaction error and must decide whether the transaction is committable before cleanup. Here the required evidence is one row per key remains and equal-timestamp ties resolve repeatably.

Question 436

The reviewer rejects the current behavior: Using MAX timestamp alone can return multiple rows for tied timestamps. The actual requirement is: An event ingestion table receives multiple versions for a natural key and must retain the latest ingestion timestamp deterministically. Which corrective implementation addresses the cause?

  1. Inspect XACT_STATE in CATCH and roll back an uncommittable transaction
  2. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold
  3. Use OPENJSON with an appropriate path and WITH schema for typed projected fields
  4. Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one

Explanation

Correct Answer

D:

Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one. ROW_NUMBER returns one winner per partition when a deterministic ordering is provided. This directly corrects the observed failure, and success can be checked because one row per key remains and equal-timestamp ties resolve repeatably.

Incorrect Answers

A:

XACT_STATE distinguishes active committable and uncommittable transaction states. Although relevant to a stored procedure catches a transaction error and must decide whether the transaction is committable before cleanup, this action would not correct the recorded production failure: using MAX timestamp alone can return multiple rows for tied timestamps. Use the target remedy instead.

B:

Fuzzy matching scores approximate string similarity and should support human review of borderline cases. Although relevant to a supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only, this action would not correct the recorded production failure: using MAX timestamp alone can return multiple rows for tied timestamps. Use the target remedy instead.

C:

OPENJSON expands JSON array entries into a relational rowset and can type columns. Although relevant to a service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL, this action would not correct the recorded production failure: using MAX timestamp alone can return multiple rows for tied timestamps. Use the target remedy instead.

Question 437

A development review identifies this database requirement: An anomaly report should compare each machine's current reading to its immediately preceding reading in time. Which implementation best satisfies this requirement?

  1. Use LAG within a partition by machine ordered by measurement timestamp
  2. Use a correlated EXISTS predicate against unpaid invoices
  3. Use a recursive common table expression with an anchor, recursive member and termination condition
  4. Use OPENJSON with an appropriate path and WITH schema for typed projected fields

Explanation

Correct Answer

A:

LAG reads the prior ordered row in the same window partition. For this stated production need, the recommended implementation is: Use LAG within a partition by machine ordered by measurement timestamp. Evidence to look for: the first event has no prior value and later readings show the correct delta.

Incorrect Answers

B:

EXISTS tests whether a related row exists, without joining or repeating the parent. That method solves a different requirement: a report must include only customers who have at least one unpaid invoice without multiplying customer rows. The current case instead requires use LAG within a partition by machine ordered by measurement timestamp.

C:

Recursive CTEs iteratively expand related rows until no further matches exist. That method solves a different requirement: a report must navigate organizational parent-child relationships of unknown depth stored as EmployeeId and ManagerId. The current case instead requires use LAG within a partition by machine ordered by measurement timestamp.

D:

OPENJSON expands JSON array entries into a relational rowset and can type columns. That method solves a different requirement: a service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. The current case instead requires use LAG within a partition by machine ordered by measurement timestamp.

Question 438

The engineer chooses the following change: Use LAG within a partition by machine ordered by measurement timestamp. Given that an anomaly report should compare each machine's current reading to its immediately preceding reading in time. Which technical principle most directly explains why it works?

  1. A correlated expression binds outer-row values to its subquery evaluation
  2. LAG reads the prior ordered row in the same window partition
  3. Native JSON constructors handle escaping and represent values structurally
  4. Regular-expression replacement transforms matched substrings according to the pattern

Explanation

Correct Answer

B:

LAG reads the prior ordered row in the same window partition. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: the first event has no prior value and later readings show the correct delta.

Incorrect Answers

A:

A correlated expression binds outer-row values to its subquery evaluation. That principle is applicable when an invoice query must return clients whose most recent payment date is later than their own contract start date. It does not explain the selected change in the current case, which depends on lAG reads the prior ordered row in the same window partition.

C:

Native JSON constructors handle escaping and represent values structurally. That principle is applicable when a SQL API needs to return one structured JSON object per customer instead of manually building a quoted string. It does not explain the selected change in the current case, which depends on lAG reads the prior ordered row in the same window partition.

D:

Regular-expression replacement transforms matched substrings according to the pattern. That principle is applicable when a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements. It does not explain the selected change in the current case, which depends on lAG reads the prior ordered row in the same window partition.

Question 439

A staging acceptance test is being designed for this change: Use LAG within a partition by machine ordered by measurement timestamp. The check must catch this potential failure: A global prior-row comparison can mix readings from separate machines. Which observed outcome demonstrates the desired behavior?

  1. The rewritten query returns identical aggregates and has a readable execution plan
  2. Valid identifiers pass and malformed identifiers fail the sample test suite
  3. The first event has no prior value and later readings show the correct delta
  4. A returned attributes array parses as a JSON array with its nested members intact

Explanation

Correct Answer

C:

The first event has no prior value and later readings show the correct delta. This is the direct acceptance criterion because lAG reads the prior ordered row in the same window partition. The validation should also distinguish the failure condition: a global prior-row comparison can mix readings from separate machines.

Incorrect Answers

A:

The rewritten query returns identical aggregates and has a readable execution plan. That observation would validate a different requirement: a complex query repeats the same filtered sales subquery in three downstream aggregations and needs readable decomposition. Here the required evidence is the first event has no prior value and later readings show the correct delta.

B:

Valid identifiers pass and malformed identifiers fail the sample test suite. That observation would validate a different requirement: a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Here the required evidence is the first event has no prior value and later readings show the correct delta.

D:

A returned attributes array parses as a JSON array with its nested members intact. That observation would validate a different requirement: a SQL API must extract a nested JSON array of product attributes from each payload while preserving it as valid JSON, not a quoted scalar string. Here the required evidence is the first event has no prior value and later readings show the correct delta.

Question 440

The production rollout exhibits this defect: A global prior-row comparison can mix readings from separate machines. The actual requirement is: An anomaly report should compare each machine's current reading to its immediately preceding reading in time. Which corrective implementation addresses the cause?

  1. Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine
  2. Wrap transactional statements in TRY CATCH and apply rollback and THROW in the error path
  3. Inspect XACT_STATE in CATCH and roll back an uncommittable transaction
  4. Use LAG within a partition by machine ordered by measurement timestamp

Explanation

Correct Answer

D:

Use LAG within a partition by machine ordered by measurement timestamp. LAG reads the prior ordered row in the same window partition. This directly corrects the observed failure, and success can be checked because the first event has no prior value and later readings show the correct delta.

Incorrect Answers

A:

MATCH relates graph nodes through declared edge patterns. Although relevant to a SQL graph model stores follows relationships between accounts and needs paths connecting related nodes, this action would not correct the recorded production failure: a global prior-row comparison can mix readings from separate machines. Use the target remedy instead.

B:

Transaction control and exception propagation prevent silent partial success. Although relevant to an import procedure must undo all partial changes and return meaningful error details when an operation fails after the first insert, this action would not correct the recorded production failure: a global prior-row comparison can mix readings from separate machines. Use the target remedy instead.

C:

XACT_STATE distinguishes active committable and uncommittable transaction states. Although relevant to a stored procedure catches a transaction error and must decide whether the transaction is committable before cleanup, this action would not correct the recorded production failure: a global prior-row comparison can mix readings from separate machines. Use the target remedy instead.

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

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