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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 16

Question 150

The engineer chooses the following change: Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame. Given that a billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows. Which technical principle most directly explains why it works?

  1. OPENJSON expands JSON array entries into a relational rowset and can type columns
  2. An ordered window aggregation retains each invoice row while accumulating prior amounts
  3. Native JSON constructors handle escaping and represent values structurally
  4. Regular-expression predicates test structured string patterns rather than simple substrings

Explanation

Correct Answer

B:

An ordered window aggregation retains each invoice row while accumulating prior amounts. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: invoice rows remain present and their running totals increase in the intended order.

Incorrect Answers

A:

OPENJSON expands JSON array entries into a relational rowset and can type columns. That principle is applicable when a service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. It does not explain the selected change in the current case, which depends on an ordered window aggregation retains each invoice row while accumulating prior amounts.

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 an ordered window aggregation retains each invoice row while accumulating prior amounts.

D:

Regular-expression predicates test structured string patterns rather than simple substrings. That principle is applicable when a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. It does not explain the selected change in the current case, which depends on an ordered window aggregation retains each invoice row while accumulating prior amounts.

Question 151

A staging acceptance test is being designed for this change: Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame. The check must catch this potential failure: GROUP BY customer loses individual invoice row granularity. Which observed outcome demonstrates the desired behavior?

  1. Dashes and brackets are stripped while numeric digits are retained
  2. The rewritten query returns identical aggregates and has a readable execution plan
  3. Invoice rows remain present and their running totals increase in the intended order
  4. A returned attributes array parses as a JSON array with its nested members intact

Explanation

Correct Answer

C:

Invoice rows remain present and their running totals increase in the intended order. This is the direct acceptance criterion because an ordered window aggregation retains each invoice row while accumulating prior amounts. The validation should also distinguish the failure condition: gROUP BY customer loses individual invoice row granularity.

Incorrect Answers

A:

Dashes and brackets are stripped while numeric digits are retained. That observation would validate a different requirement: a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements. Here the required evidence is invoice rows remain present and their running totals increase in the intended order.

B:

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 invoice rows remain present and their running totals increase in the intended order.

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 invoice rows remain present and their running totals increase in the intended order.

Question 152

The production rollout exhibits this defect: GROUP BY customer loses individual invoice row granularity. The actual requirement is: A billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows. Which corrective implementation addresses the cause?

  1. Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine
  2. Inspect XACT_STATE in CATCH and roll back an uncommittable transaction
  3. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold
  4. Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame

Explanation

Correct Answer

D:

Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame. An ordered window aggregation retains each invoice row while accumulating prior amounts. This directly corrects the observed failure, and success can be checked because invoice rows remain present and their running totals increase in the intended order.

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: gROUP BY customer loses individual invoice row granularity. Use the target remedy instead.

B:

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: gROUP BY customer loses individual invoice row granularity. Use the target remedy instead.

C:

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: gROUP BY customer loses individual invoice row granularity. Use the target remedy instead.

Question 153

The SQL platform team receives the following production requirement: A service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. Which implementation best satisfies this requirement?

  1. Use OPENJSON with an appropriate path and WITH schema for typed projected fields
  2. Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one
  3. Use a correlated EXISTS predicate against unpaid invoices
  4. Use LAG within a partition by machine ordered by measurement timestamp

Explanation

Correct Answer

A:

OPENJSON expands JSON array entries into a relational rowset and can type columns. For this stated production need, the recommended implementation is: Use OPENJSON with an appropriate path and WITH schema for typed projected fields. Evidence to look for: the output has one typed row per source array element.

Incorrect Answers

B:

ROW_NUMBER returns one winner per partition when a deterministic ordering is provided. That method solves a different requirement: an event ingestion table receives multiple versions for a natural key and must retain the latest ingestion timestamp deterministically. The current case instead requires use OPENJSON with an appropriate path and WITH schema for typed projected fields.

C:

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 OPENJSON with an appropriate path and WITH schema for typed projected fields.

D:

LAG reads the prior ordered row in the same window partition. That method solves a different requirement: an anomaly report should compare each machine's current reading to its immediately preceding reading in time. The current case instead requires use OPENJSON with an appropriate path and WITH schema for typed projected fields.

Question 154

The design document proposes the following implementation: Use OPENJSON with an appropriate path and WITH schema for typed projected fields. Given that a service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. Which technical principle most directly explains why it works?

  1. A correlated expression binds outer-row values to its subquery evaluation
  2. OPENJSON expands JSON array entries into a relational rowset and can type columns
  3. Transaction control and exception propagation prevent silent partial success
  4. An ordered window aggregation retains each invoice row while accumulating prior amounts

Explanation

Correct Answer

B:

OPENJSON expands JSON array entries into a relational rowset and can type columns. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: the output has one typed row per source array element.

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 oPENJSON expands JSON array entries into a relational rowset and can type columns.

C:

Transaction control and exception propagation prevent silent partial success. That principle is applicable when an import procedure must undo all partial changes and return meaningful error details when an operation fails after the first insert. It does not explain the selected change in the current case, which depends on oPENJSON expands JSON array entries into a relational rowset and can type columns.

D:

An ordered window aggregation retains each invoice row while accumulating prior amounts. That principle is applicable when a billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows. It does not explain the selected change in the current case, which depends on oPENJSON expands JSON array entries into a relational rowset and can type columns.

Question 155

A release reviewer must verify the effect of this implementation: Use OPENJSON with an appropriate path and WITH schema for typed projected fields. The check must catch this potential failure: JSON_VALUE returns a scalar and will not expand the array into rows. Which observed outcome demonstrates the desired behavior?

  1. Known spelling variants receive candidate scores without automatically merging unrelated entities
  2. Valid identifiers pass and malformed identifiers fail the sample test suite
  3. The output has one typed row per source array element
  4. The graph query returns connected accounts matching the requested relation

Explanation

Correct Answer

C:

The output has one typed row per source array element. This is the direct acceptance criterion because oPENJSON expands JSON array entries into a relational rowset and can type columns. The validation should also distinguish the failure condition: jSON_VALUE returns a scalar and will not expand the array into rows.

Incorrect Answers

A:

Known spelling variants receive candidate scores without automatically merging unrelated entities. That observation would validate a different requirement: a supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only. Here the required evidence is the output has one typed row per source array element.

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 output has one typed row per source array element.

D:

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 the output has one typed row per source array element.

Question 156

A regression is reported after deployment: JSON_VALUE returns a scalar and will not expand the array into rows. The actual requirement is: A service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. Which corrective implementation addresses the cause?

  1. Use DENSE_RANK partitioned by month ordered descending and filter the top rank
  2. Use REGEXP_REPLACE with a reviewed pattern and replacement expression
  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

D:

Use OPENJSON with an appropriate path and WITH schema for typed projected fields. OPENJSON expands JSON array entries into a relational rowset and can type columns. This directly corrects the observed failure, and success can be checked because the output has one typed row per source array element.

Incorrect Answers

A:

Equal ordered values share the same dense rank and all top ties survive. Although relevant to a ranking report must display all salespeople tied for highest monthly sales, this action would not correct the recorded production failure: jSON_VALUE returns a scalar and will not expand the array into rows. Use the target remedy instead.

B:

Regular-expression replacement transforms matched substrings according to the pattern. Although relevant to a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements, this action would not correct the recorded production failure: jSON_VALUE returns a scalar and will not expand the array into rows. Use the target remedy instead.

C:

Recursive CTEs iteratively expand related rows until no further matches exist. Although relevant to a report must navigate organizational parent-child relationships of unknown depth stored as EmployeeId and ManagerId, this action would not correct the recorded production failure: jSON_VALUE returns a scalar and will not expand the array into rows. Use the target remedy instead.

Question 157

Before approving the database change, the architect reviews this case: A customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Which implementation best satisfies this requirement?

  1. Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine
  2. Use a correlated subquery or APPLY that evaluates the payment condition for each outer customer
  3. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold
  4. Use a recursive common table expression with an anchor, recursive member and termination condition

Explanation

Correct Answer

A:

Regular-expression predicates test structured string patterns rather than simple substrings. For this stated production need, the recommended implementation is: Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine. Evidence to look for: valid identifiers pass and malformed identifiers fail the sample test suite.

Incorrect Answers

B:

A correlated expression binds outer-row values to its subquery evaluation. That method solves a different requirement: an invoice query must return clients whose most recent payment date is later than their own contract start date. The current case instead requires use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine.

C:

Fuzzy matching scores approximate string similarity and should support human review of borderline cases. That method solves a different requirement: a supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only. The current case instead requires use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine.

D:

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 REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine.

Question 158

The security and data engineering reviewers accept this action: Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine. Given that a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Which technical principle most directly explains why it works?

  1. JSON_QUERY returns an object or array fragment rather than the scalar extracted by JSON_VALUE
  2. Regular-expression predicates test structured string patterns rather than simple substrings
  3. Transaction control and exception propagation prevent silent partial success
  4. Equal ordered values share the same dense rank and all top ties survive

Explanation

Correct Answer

B:

Regular-expression predicates test structured string patterns rather than simple substrings. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: valid identifiers pass and malformed identifiers fail the sample test suite.

Incorrect Answers

A:

JSON_QUERY returns an object or array fragment rather than the scalar extracted by JSON_VALUE. That principle is applicable when 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. It does not explain the selected change in the current case, which depends on regular-expression predicates test structured string patterns rather than simple substrings.

C:

Transaction control and exception propagation prevent silent partial success. That principle is applicable when an import procedure must undo all partial changes and return meaningful error details when an operation fails after the first insert. It does not explain the selected change in the current case, which depends on regular-expression predicates test structured string patterns rather than simple substrings.

D:

Equal ordered values share the same dense rank and all top ties survive. That principle is applicable when a ranking report must display all salespeople tied for highest monthly sales. It does not explain the selected change in the current case, which depends on regular-expression predicates test structured string patterns rather than simple substrings.

Question 159

An incident post-change check is required for this fix: Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine. The check must catch this potential failure: Using LIKE with a broad wildcard may accept invalid layouts. Which observed outcome demonstrates the desired behavior?

  1. Each eligible customer appears once regardless of invoice count
  2. Invoice rows remain present and their running totals increase in the intended order
  3. Valid identifiers pass and malformed identifiers fail the sample test suite
  4. The output has one typed row per source array element

Explanation

Correct Answer

C:

Valid identifiers pass and malformed identifiers fail the sample test suite. This is the direct acceptance criterion because regular-expression predicates test structured string patterns rather than simple substrings. The validation should also distinguish the failure condition: using LIKE with a broad wildcard may accept invalid layouts.

Incorrect Answers

A:

Each eligible customer appears once regardless of invoice count. That observation would validate a different requirement: a report must include only customers who have at least one unpaid invoice without multiplying customer rows. Here the required evidence is valid identifiers pass and malformed identifiers fail the sample test suite.

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 valid identifiers pass and malformed identifiers fail the sample test suite.

D:

The output has one typed row per source array element. That observation would validate a different requirement: a service receives JSON arrays of product lines and must extract one relational row per array element in T-SQL. Here the required evidence is valid identifiers pass and malformed identifiers fail the sample test suite.

Question 160

The operational test fails because: Using LIKE with a broad wildcard may accept invalid layouts. The actual requirement is: A customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. Which corrective implementation addresses the cause?

  1. Use LAG within a partition by machine ordered by measurement timestamp
  2. Use named nonrecursive CTEs to structure the intermediate relational expressions
  3. Use ROW_NUMBER over each business key ordered by timestamp and a stable tie-breaker, filtering rn equal to one
  4. Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine

Explanation

Correct Answer

D:

Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine. Regular-expression predicates test structured string patterns rather than simple substrings. This directly corrects the observed failure, and success can be checked because valid identifiers pass and malformed identifiers fail the sample test suite.

Incorrect Answers

A:

LAG reads the prior ordered row in the same window partition. Although relevant to an anomaly report should compare each machine's current reading to its immediately preceding reading in time, this action would not correct the recorded production failure: using LIKE with a broad wildcard may accept invalid layouts. Use the target remedy instead.

B:

CTEs define query-scoped named result expressions, improving composability and clarity. Although relevant to a complex query repeats the same filtered sales subquery in three downstream aggregations and needs readable decomposition, this action would not correct the recorded production failure: using LIKE with a broad wildcard may accept invalid layouts. Use the target remedy instead.

C:

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: using LIKE with a broad wildcard may accept invalid layouts. Use the target remedy instead.

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

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