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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 17

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.

Question 161

A cross-functional engineering review records the following need: A supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only. Which implementation best satisfies this requirement?

  1. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold
  2. Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine
  3. Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine
  4. Use JSON_QUERY with the appropriate path to return the nested JSON fragment

Explanation

Correct Answer

A:

Fuzzy matching scores approximate string similarity and should support human review of borderline cases. For this stated production need, the recommended implementation is: Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold. Evidence to look for: known spelling variants receive candidate scores without automatically merging unrelated entities.

Incorrect Answers

B:

Regular-expression predicates test structured string patterns rather than simple substrings. That method solves a different requirement: a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. The current case instead requires calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold.

C:

MATCH relates graph nodes through declared edge patterns. That method solves a different requirement: a SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. The current case instead requires calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold.

D:

JSON_QUERY returns an object or array fragment rather than the scalar extracted by JSON_VALUE. That method solves 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. The current case instead requires calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold.

Question 162

The database team applies the following decision: Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold. Given that a supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only. Which technical principle most directly explains why it works?

  1. Native JSON constructors handle escaping and represent values structurally
  2. Fuzzy matching scores approximate string similarity and should support human review of borderline cases
  3. Regular-expression replacement transforms matched substrings according to the pattern
  4. Transaction control and exception propagation prevent silent partial success

Explanation

Correct Answer

B:

Fuzzy matching scores approximate string similarity and should support human review of borderline cases. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: known spelling variants receive candidate scores without automatically merging unrelated entities.

Incorrect Answers

A:

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 fuzzy matching scores approximate string similarity and should support human review of borderline cases.

C:

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 fuzzy matching scores approximate string similarity and should support human review of borderline cases.

D:

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 fuzzy matching scores approximate string similarity and should support human review of borderline cases.

Question 163

The deployment validation team is assessing this proposal: Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold. The check must catch this potential failure: Binary equality misses minor name variations. Which observed outcome demonstrates the desired behavior?

  1. Customers are filtered based on their own payment and contract values
  2. The output has one typed row per source array element
  3. Known spelling variants receive candidate scores without automatically merging unrelated entities
  4. Each eligible customer appears once regardless of invoice count

Explanation

Correct Answer

C:

Known spelling variants receive candidate scores without automatically merging unrelated entities. This is the direct acceptance criterion because fuzzy matching scores approximate string similarity and should support human review of borderline cases. The validation should also distinguish the failure condition: binary equality misses minor name variations.

Incorrect Answers

A:

Customers are filtered based on their own payment and contract values. That observation would validate a different requirement: an invoice query must return clients whose most recent payment date is later than their own contract start date. Here the required evidence is known spelling variants receive candidate scores without automatically merging unrelated entities.

B:

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 known spelling variants receive candidate scores without automatically merging unrelated entities.

D:

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 known spelling variants receive candidate scores without automatically merging unrelated entities.

Question 164

The reviewer rejects the current behavior: Binary equality misses minor name variations. The actual requirement is: A supplier onboarding flow must detect spelling variants such as slightly different legal names for potential review rather than exact-match only. Which corrective implementation addresses the cause?

  1. Use a recursive common table expression with an anchor, recursive member and termination condition
  2. Inspect XACT_STATE in CATCH and roll back an uncommittable transaction
  3. Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame
  4. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold

Explanation

Correct Answer

D:

Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold. Fuzzy matching scores approximate string similarity and should support human review of borderline cases. This directly corrects the observed failure, and success can be checked because known spelling variants receive candidate scores without automatically merging unrelated entities.

Incorrect Answers

A:

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: binary equality misses minor name variations. 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: binary equality misses minor name variations. Use the target remedy instead.

C:

An ordered window aggregation retains each invoice row while accumulating prior amounts. Although relevant to a billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows, this action would not correct the recorded production failure: binary equality misses minor name variations. Use the target remedy instead.

Question 165

A development review identifies this database requirement: A SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. Which implementation best satisfies this requirement?

  1. Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine
  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. Calculate JARO_WINKLER_DISTANCE or an appropriate supported similarity measure and apply a reviewed threshold

Explanation

Correct Answer

A:

MATCH relates graph nodes through declared edge patterns. For this stated production need, the recommended implementation is: Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine. Evidence to look for: the graph query returns connected accounts matching the requested relation.

Incorrect Answers

B:

Regular-expression replacement transforms matched substrings according to the pattern. That method solves a different requirement: a contact normalization job must remove punctuation from legacy phone strings using supported regex replacements. The current case instead requires use graph node and edge tables with a MATCH graph pattern on the supported SQL engine.

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 graph node and edge tables with a MATCH graph pattern on the supported SQL engine.

D:

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 graph node and edge tables with a MATCH graph pattern on the supported SQL engine.

Question 166

The engineer chooses the following change: Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine. Given that a SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. Which technical principle most directly explains why it works?

  1. Native JSON constructors handle escaping and represent values structurally
  2. MATCH relates graph nodes through declared edge patterns
  3. EXISTS tests whether a related row exists, without joining or repeating the parent
  4. OPENJSON expands JSON array entries into a relational rowset and can type columns

Explanation

Correct Answer

B:

MATCH relates graph nodes through declared edge patterns. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: the graph query returns connected accounts matching the requested relation.

Incorrect Answers

A:

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 mATCH relates graph nodes through declared edge patterns.

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 mATCH relates graph nodes through declared edge patterns.

D:

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 mATCH relates graph nodes through declared edge patterns.

Question 167

A staging acceptance test is being designed for this change: Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine. The check must catch this potential failure: A text LIKE filter over node labels cannot traverse edges. Which observed outcome demonstrates the desired behavior?

  1. The rewritten query returns identical aggregates and has a readable execution plan
  2. A returned attributes array parses as a JSON array with its nested members intact
  3. The graph query returns connected accounts matching the requested relation
  4. Every tied leader is returned for each month

Explanation

Correct Answer

C:

The graph query returns connected accounts matching the requested relation. This is the direct acceptance criterion because mATCH relates graph nodes through declared edge patterns. The validation should also distinguish the failure condition: a text LIKE filter over node labels cannot traverse edges.

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 graph query returns connected accounts matching the requested relation.

B:

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 graph query returns connected accounts matching the requested relation.

D:

Every tied leader is returned for each month. That observation would validate a different requirement: a ranking report must display all salespeople tied for highest monthly sales. Here the required evidence is the graph query returns connected accounts matching the requested relation.

Question 168

The production rollout exhibits this defect: A text LIKE filter over node labels cannot traverse edges. The actual requirement is: A SQL graph model stores follows relationships between accounts and needs paths connecting related nodes. Which corrective implementation addresses the cause?

  1. Use LAG within a partition by machine ordered by measurement timestamp
  2. Use a correlated subquery or APPLY that evaluates the payment condition for each outer customer
  3. Use SUM(Amount) OVER with PARTITION BY CustomerId and an explicit ordered ROWS frame
  4. Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine

Explanation

Correct Answer

D:

Use graph node and edge tables with a MATCH graph pattern on the supported SQL engine. MATCH relates graph nodes through declared edge patterns. This directly corrects the observed failure, and success can be checked because the graph query returns connected accounts matching the requested relation.

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: a text LIKE filter over node labels cannot traverse edges. Use the target remedy instead.

B:

A correlated expression binds outer-row values to its subquery evaluation. Although relevant to an invoice query must return clients whose most recent payment date is later than their own contract start date, this action would not correct the recorded production failure: a text LIKE filter over node labels cannot traverse edges. Use the target remedy instead.

C:

An ordered window aggregation retains each invoice row while accumulating prior amounts. Although relevant to a billing report must show each invoice amount plus the running total per customer ordered by due date without collapsing invoice rows, this action would not correct the recorded production failure: a text LIKE filter over node labels cannot traverse edges. Use the target remedy instead.

Question 169

The SQL platform team receives the following production requirement: An invoice query must return clients whose most recent payment date is later than their own contract start date. Which implementation best satisfies this requirement?

  1. Use a correlated subquery or APPLY that evaluates the payment condition for each outer customer
  2. Use REGEXP_LIKE with an anchored validated identifier expression on a supported SQL engine
  3. Use supported JSON_OBJECT construction with named properties
  4. Use a recursive common table expression with an anchor, recursive member and termination condition

Explanation

Correct Answer

A:

A correlated expression binds outer-row values to its subquery evaluation. For this stated production need, the recommended implementation is: Use a correlated subquery or APPLY that evaluates the payment condition for each outer customer. Evidence to look for: customers are filtered based on their own payment and contract values.

Incorrect Answers

B:

Regular-expression predicates test structured string patterns rather than simple substrings. That method solves a different requirement: a customer import must accept values matching a defined identifier format and reject nonmatching records using supported T-SQL regex features. The current case instead requires use a correlated subquery or APPLY that evaluates the payment condition for each outer customer.

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 a correlated subquery or APPLY that evaluates the payment condition for each outer customer.

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 a correlated subquery or APPLY that evaluates the payment condition for each outer customer.

Question 170

The design document proposes the following implementation: Use a correlated subquery or APPLY that evaluates the payment condition for each outer customer. Given that an invoice query must return clients whose most recent payment date is later than their own contract start date. Which technical principle most directly explains why it works?

  1. Regular-expression replacement transforms matched substrings according to the pattern
  2. A correlated expression binds outer-row values to its subquery evaluation
  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:

A correlated expression binds outer-row values to its subquery evaluation. This explains why the selected approach meets the requirement rather than merely changing a nearby service. A confirming observation is: customers are filtered based on their own payment and contract values.

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 a correlated expression binds outer-row values to its subquery evaluation.

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 a correlated expression binds outer-row values to its subquery evaluation.

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 a correlated expression binds outer-row values to its subquery evaluation.

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

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