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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 12

Question 110

A complex API repeatedly needs the same parameterized multi-row result set in a join. Which result distinguishes a successful implementation from a cosmetic change?

  1. One call handles all requested IDs consistently and reduces client/server round trips.
  2. Consumers query current source rows through the same named projection.
  3. The following SELECT references the CTE and returns the same rows without persistent objects.
  4. Calling the function in a relational query returns the expected multiple rows efficiently.

Explanation

Correct Answer

D:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. The observation “Calling the function in a relational query returns the expected multiple rows efficiently” directly confirms the chosen action worked for this situation: A complex API repeatedly needs the same parameterized multi-row result set in a join.

Incorrect Answers

A:

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 complex API repeatedly needs the same parameterized multi-row result set in a join. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

B:

A standard view stores query definition rather than a separately refreshed result set. This observation would not establish that the required result occurred for A complex API repeatedly needs the same parameterized multi-row result set in a join. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

C:

A CTE is a named subquery scoped to a single following DML statement, not an automatic materialized table. This observation would not establish that the required result occurred for A complex API repeatedly needs the same parameterized multi-row result set in a join. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

Question 111

A developer is choosing between a scalar function and a result usable in FROM with filters. Which solution is the most appropriate for the scenario?

  1. Use a scalar function when a single return value and performance constraints fit.
  2. Implement narrow database-side enforcement with a constraint or trigger matched to the state-dependent rule.
  3. Use ROW_NUMBER with a complete tie-breaking ORDER BY inside the window.
  4. Implement an appropriate inline table-valued function with parameters.

Explanation

Correct Answer

D:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. For the described situation—A developer is choosing between a scalar function and a result usable in FROM with filters—the targeted fix is Implement an appropriate inline table-valued function with parameters. A successful test should show: Calling the function in a relational query returns the expected multiple rows efficiently.

Incorrect Answers

A:

A scalar function encapsulates a single-result expression, not a full transaction workflow. But that technique does not solve the stated problem—A developer is choosing between a scalar function and a result usable in FROM with filters. The needed intervention is Implement an appropriate inline table-valued function with parameters.

B:

State-dependent protections need carefully tested enforcement; triggers must handle statement sets and errors. But that technique does not solve the stated problem—A developer is choosing between a scalar function and a result usable in FROM with filters. The needed intervention is Implement an appropriate inline table-valued function with parameters.

C:

ROW_NUMBER never assigns the same ordinal twice; deterministic tie-breaking stabilizes ordering. But that technique does not solve the stated problem—A developer is choosing between a scalar function and a result usable in FROM with filters. The needed intervention is Implement an appropriate inline table-valued function with parameters.

Question 112

A developer is choosing between a scalar function and a result usable in FROM with filters. What should a technical reviewer verify before approving completion?

  1. Calling the function in a relational query returns the expected multiple rows efficiently.
  2. The TVF joins efficiently to callers and returns correct results across parameter values.
  3. One call handles all requested IDs consistently and reduces client/server round trips.
  4. The inserted rows map each JSON element into typed fields with validation.

Explanation

Correct Answer

A:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. The observation “Calling the function in a relational query returns the expected multiple rows efficiently” directly confirms the chosen action worked for this situation: A developer is choosing between a scalar function and a result usable in FROM with filters.

Incorrect Answers

B:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. This observation would not establish that the required result occurred for A developer is choosing between a scalar function and a result usable in FROM with filters. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

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 developer is choosing between a scalar function and a result usable in FROM with filters. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

D:

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 developer is choosing between a scalar function and a result usable in FROM with filters. The confirming test is: Calling the function in a relational query returns the expected multiple rows efficiently.

Question 113

A tax application needs a deterministic reusable computation returning exactly one rate. What should the SQL developer implement after verifying the conditions?

  1. Implement TRY...CATCH with rollback and THROW to surface the failure.
  2. Implement an appropriate inline table-valued function with parameters.
  3. Verify tenant, capacity, licensing, and supported Copilot in Fabric configuration before use.
  4. Use a scalar function when a single return value and performance constraints fit.

Explanation

Correct Answer

D:

A scalar function encapsulates a single-result expression, not a full transaction workflow. For the described situation—A tax application needs a deterministic reusable computation returning exactly one rate—the targeted fix is Use a scalar function when a single return value and performance constraints fit. A successful test should show: Unit tests confirm one value per supported argument combination without hidden mutations.

Incorrect Answers

A:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. But that technique does not solve the stated problem—A tax application needs a deterministic reusable computation returning exactly one rate. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

B:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. But that technique does not solve the stated problem—A tax application needs a deterministic reusable computation returning exactly one rate. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

C:

Copilot availability depends on supported platform settings and entitlements, not only local IDE configuration. But that technique does not solve the stated problem—A tax application needs a deterministic reusable computation returning exactly one rate. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

Question 114

A tax application needs a deterministic reusable computation returning exactly one rate. Which verification finding is most specific to this scenario?

  1. Unit tests confirm one value per supported argument combination without hidden mutations.
  2. The batch returns the same totals with lower CPU time on representative volumes.
  3. The app reads approved profile fields and cannot access restricted source columns.
  4. True matches are found in the intended array or object path while nonmatches are excluded.

Explanation

Correct Answer

A:

A scalar function encapsulates a single-result expression, not a full transaction workflow. The observation “Unit tests confirm one value per supported argument combination without hidden mutations” directly confirms the chosen action worked for this situation: A tax application needs a deterministic reusable computation returning exactly one rate.

Incorrect Answers

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. This observation would not establish that the required result occurred for A tax application needs a deterministic reusable computation returning exactly one rate. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

C:

Views can provide a data-access interface when underlying object permissions are managed appropriately. This observation would not establish that the required result occurred for A tax application needs a deterministic reusable computation returning exactly one rate. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

D:

JSON membership functions compare structured content, not formatting-dependent text substrings. This observation would not establish that the required result occurred for A tax application needs a deterministic reusable computation returning exactly one rate. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

Question 115

A batch process calculates a customer class multiplier from arguments in several queries. Which approach achieves the intended result without bypassing the stated controls?

  1. Use a scalar function when a single return value and performance constraints fit.
  2. Pass the intended identifiers in a table-valued parameter to a set-based procedure where supported.
  3. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.
  4. Build a recursive CTE with anchor and recursive members plus a safe termination strategy.

Explanation

Correct Answer

A:

A scalar function encapsulates a single-result expression, not a full transaction workflow. For the described situation—A batch process calculates a customer class multiplier from arguments in several queries—the targeted fix is Use a scalar function when a single return value and performance constraints fit. A successful test should show: Unit tests confirm one value per supported argument combination without hidden mutations.

Incorrect Answers

B:

Table-valued parameters support multirow input to stored procedures without building unsafe dynamic SQL. But that technique does not solve the stated problem—A batch process calculates a customer class multiplier from arguments in several queries. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

C:

Stored procedures support parameterized transactional operations and shared business enforcement. But that technique does not solve the stated problem—A batch process calculates a customer class multiplier from arguments in several queries. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

D:

Recursive CTEs repeatedly apply the recursive member and require attention to cycles and MAXRECURSION. But that technique does not solve the stated problem—A batch process calculates a customer class multiplier from arguments in several queries. The needed intervention is Use a scalar function when a single return value and performance constraints fit.

Question 116

A batch process calculates a customer class multiplier from arguments in several queries. How should the team validate the selected design?

  1. An insert against the view updates the expected base tables and rejects invalid mappings.
  2. Unit tests confirm one value per supported argument combination without hidden mutations.
  3. Consumers query current source rows through the same named projection.
  4. The tool can retrieve allowed schema metadata but cannot modify or expose unrelated assets.

Explanation

Correct Answer

B:

A scalar function encapsulates a single-result expression, not a full transaction workflow. The observation “Unit tests confirm one value per supported argument combination without hidden mutations” directly confirms the chosen action worked for this situation: A batch process calculates a customer class multiplier from arguments in several queries.

Incorrect Answers

A:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. This observation would not establish that the required result occurred for A batch process calculates a customer class multiplier from arguments in several queries. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

C:

A standard view stores query definition rather than a separately refreshed result set. This observation would not establish that the required result occurred for A batch process calculates a customer class multiplier from arguments in several queries. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

D:

Fabric MCP tooling is a controlled integration boundary, not blanket cross-workspace authorization. This observation would not establish that the required result occurred for A batch process calculates a customer class multiplier from arguments in several queries. The confirming test is: Unit tests confirm one value per supported argument combination without hidden mutations.

Question 117

An invoice system must submit several database writes as one operation and report business errors. What intervention should the responsible engineer choose?

  1. Use a scalar function when a single return value and performance constraints fit.
  2. Redesign the trigger to avoid recursive side effects and validate its multi-row behavior.
  3. Use a supported SQL graph MATCH expression across declared node and edge aliases.
  4. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

Explanation

Correct Answer

D:

Stored procedures support parameterized transactional operations and shared business enforcement. For the described situation—An invoice system must submit several database writes as one operation and report business errors—the targeted fix is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling. A successful test should show: Successful calls commit all intended records; injected failures leave none partially committed.

Incorrect Answers

A:

A scalar function encapsulates a single-result expression, not a full transaction workflow. But that technique does not solve the stated problem—An invoice system must submit several database writes as one operation and report business errors. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

B:

Trigger recursion and row-at-a-time assumptions can create performance and correctness failures. But that technique does not solve the stated problem—An invoice system must submit several database writes as one operation and report business errors. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

C:

MATCH expresses graph patterns over node and edge relationships in SQL graph queries. But that technique does not solve the stated problem—An invoice system must submit several database writes as one operation and report business errors. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

Question 118

An invoice system must submit several database writes as one operation and report business errors. What observable outcome proves the recommendation worked?

  1. Consumers query current source rows through the same named projection.
  2. Calling the function in a relational query returns the expected multiple rows efficiently.
  3. Invalid device/reading combinations fail at ingestion and valid concurrent readings persist.
  4. Successful calls commit all intended records; injected failures leave none partially committed.

Explanation

Correct Answer

D:

Stored procedures support parameterized transactional operations and shared business enforcement. The observation “Successful calls commit all intended records; injected failures leave none partially committed” directly confirms the chosen action worked for this situation: An invoice system must submit several database writes as one operation and report business errors.

Incorrect Answers

A:

A standard view stores query definition rather than a separately refreshed result set. This observation would not establish that the required result occurred for An invoice system must submit several database writes as one operation and report business errors. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

B:

An inline TVF exposes a composable table expression whereas a scalar UDF returns one value. This observation would not establish that the required result occurred for An invoice system must submit several database writes as one operation and report business errors. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

C:

Multiple complementary constraints preserve distinct integrity properties; none substitutes for the others. This observation would not establish that the required result occurred for An invoice system must submit several database writes as one operation and report business errors. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

Question 119

An application repeats multi-statement order creation logic in many services with inconsistent transactions. Which design choice BEST addresses the root issue?

  1. Prefer an inline TVF where composability and execution plan behavior are appropriate.
  2. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.
  3. Implement TRY...CATCH with rollback and THROW to surface the failure.
  4. Evaluate a columnstore index for the large analytical fact table.

Explanation

Correct Answer

B:

Stored procedures support parameterized transactional operations and shared business enforcement. For the described situation—An application repeats multi-statement order creation logic in many services with inconsistent transactions—the targeted fix is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling. A successful test should show: Successful calls commit all intended records; injected failures leave none partially committed.

Incorrect Answers

A:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. But that technique does not solve the stated problem—An application repeats multi-statement order creation logic in many services with inconsistent transactions. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

C:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. But that technique does not solve the stated problem—An application repeats multi-statement order creation logic in many services with inconsistent transactions. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

D:

Columnstore organizes and compresses columns for analytic scans but can cost more for some OLTP mutations. But that technique does not solve the stated problem—An application repeats multi-statement order creation logic in many services with inconsistent transactions. The needed intervention is Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.

Question 120

An application repeats multi-statement order creation logic in many services with inconsistent transactions. Which result would provide the strongest acceptance evidence?

  1. Consumers query current source rows through the same named projection.
  2. An attempted update of approved records is rejected with a clear error while draft edits remain possible.
  3. The query returns the expected extracted token and handles missing matches correctly.
  4. Successful calls commit all intended records; injected failures leave none partially committed.

Explanation

Correct Answer

D:

Stored procedures support parameterized transactional operations and shared business enforcement. The observation “Successful calls commit all intended records; injected failures leave none partially committed” directly confirms the chosen action worked for this situation: An application repeats multi-statement order creation logic in many services with inconsistent transactions.

Incorrect Answers

A:

A standard view stores query definition rather than a separately refreshed result set. This observation would not establish that the required result occurred for An application repeats multi-statement order creation logic in many services with inconsistent transactions. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

B:

State-dependent protections need carefully tested enforcement; triggers must handle statement sets and errors. This observation would not establish that the required result occurred for An application repeats multi-statement order creation logic in many services with inconsistent transactions. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

C:

REGEXP_SUBSTR extracts matching text; REGEXP_LIKE only evaluates whether a match exists. This observation would not establish that the required result occurred for An application repeats multi-statement order creation logic in many services with inconsistent transactions. The confirming test is: Successful calls commit all intended records; injected failures leave none partially committed.

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