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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 16

Question 150

A procedure builds an optional filter query by concatenating a user's search text into SQL. What observable outcome proves the recommendation worked?

  1. The app reads approved profile fields and cannot access restricted source columns.
  2. A forced constraint error rolls back the unit of work and reaches the caller.
  3. Duplicate non-null emails fail while multiple missing values behave per the documented rule.
  4. A hostile quote-containing test is treated as data and does not alter SQL structure.

Explanation

Correct Answer

D:

Parameterized dynamic SQL separates values from executable statements and reduces injection risk. The observation “A hostile quote-containing test is treated as data and does not alter SQL structure” directly confirms the chosen action worked for this situation: A procedure builds an optional filter query by concatenating a user's search text into SQL.

Incorrect Answers

A:

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 procedure builds an optional filter query by concatenating a user's search text into SQL. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

B:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. This observation would not establish that the required result occurred for A procedure builds an optional filter query by concatenating a user's search text into SQL. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

C:

SQL Server UNIQUE and filtered unique indexes differ in how missing values can be represented. This observation would not establish that the required result occurred for A procedure builds an optional filter query by concatenating a user's search text into SQL. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

Question 151

A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. Which design choice BEST addresses the root issue?

  1. Use sp_executesql with typed parameters and allowlist any necessary object identifiers.
  2. Prefer set-based expressions or an appropriate inline TVF after measuring query plans.
  3. Create a least-privilege projection view and grant SELECT on only that interface.
  4. Use OPENJSON with a typed WITH schema to shred the array into columns.

Explanation

Correct Answer

A:

Parameterized dynamic SQL separates values from executable statements and reduces injection risk. For the described situation—A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization—the targeted fix is Use sp_executesql with typed parameters and allowlist any necessary object identifiers. A successful test should show: A hostile quote-containing test is treated as data and does not alter SQL structure.

Incorrect Answers

B:

Row-by-row function evaluation can inhibit query optimization; set-based evaluation often scales better. But that technique does not solve the stated problem—A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The needed intervention is Use sp_executesql with typed parameters and allowlist any necessary object identifiers.

C:

Views can provide a data-access interface when underlying object permissions are managed appropriately. But that technique does not solve the stated problem—A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The needed intervention is Use sp_executesql with typed parameters and allowlist any necessary object identifiers.

D:

OPENJSON exposes elements as rows and explicit schema maps document fields into SQL types. But that technique does not solve the stated problem—A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The needed intervention is Use sp_executesql with typed parameters and allowlist any necessary object identifiers.

Question 152

A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. Which result would provide the strongest acceptance evidence?

  1. A multi-row update produces complete corresponding audit rows without unexpected recursion.
  2. One call handles all requested IDs consistently and reduces client/server round trips.
  3. Valid samples pass and malformed strings are rejected on the target SQL version.
  4. A hostile quote-containing test is treated as data and does not alter SQL structure.

Explanation

Correct Answer

D:

Parameterized dynamic SQL separates values from executable statements and reduces injection risk. The observation “A hostile quote-containing test is treated as data and does not alter SQL structure” directly confirms the chosen action worked for this situation: A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization.

Incorrect Answers

A:

SQL DML triggers fire per statement and must handle all affected rows, not only one inserted row. This observation would not establish that the required result occurred for A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

B:

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 search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

C:

Regular-expression matching expresses pattern validation more precisely than broad LIKE wildcards. This observation would not establish that the required result occurred for A search endpoint accepts arbitrary strings and dynamically constructs predicates without parameterization. The confirming test is: A hostile quote-containing test is treated as data and does not alter SQL structure.

Question 153

An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. What should the database team change FIRST for this workload?

  1. Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.
  2. Implement narrow database-side enforcement with a constraint or trigger matched to the state-dependent rule.
  3. Prefer an inline TVF where composability and execution plan behavior are appropriate.
  4. Record the selected supported model and tool context, then benchmark suggestions on a held-out SQL task set.

Explanation

Correct Answer

C:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. For the described situation—An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT—the targeted fix is Prefer an inline TVF where composability and execution plan behavior are appropriate. A successful test should show: The TVF joins efficiently to callers and returns correct results across parameter values.

Incorrect Answers

A:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. But that technique does not solve the stated problem—An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

B:

State-dependent protections need carefully tested enforcement; triggers must handle statement sets and errors. But that technique does not solve the stated problem—An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

D:

AI model/tool selection influences responses, but only execution tests and review validate SQL correctness. But that technique does not solve the stated problem—An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

Question 154

An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. Which acceptance check should accompany the remediation?

  1. The TVF joins efficiently to callers and returns correct results across parameter values.
  2. The batch returns the same totals with lower CPU time on representative volumes.
  3. A forced constraint error rolls back the unit of work and reaches the caller.
  4. Exactly one latest ticket is selected per customer, including tie cases.

Explanation

Correct Answer

A:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. The observation “The TVF joins efficiently to callers and returns correct results across parameter values” directly confirms the chosen action worked for this situation: An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT.

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 An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

C:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. This observation would not establish that the required result occurred for An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

D:

A ranking window supports groupwise top-1 selection when order and tie-breakers are explicit. This observation would not establish that the required result occurred for An application calls the same aggregation from numerous contexts, but the calculation is always a single SELECT. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

Question 155

A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. Which implementation most directly satisfies the stated requirement?

  1. Implement an appropriate inline table-valued function with parameters.
  2. Encapsulate approved multi-step logic in a stored procedure with explicit transaction/error handling.
  3. Prefer an inline TVF where composability and execution plan behavior are appropriate.
  4. Enforce SKU uniqueness with a database index or constraint, not only a SELECT-then-INSERT test.

Explanation

Correct Answer

C:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. For the described situation—A developer plans a complex multi-statement TVF even though the required rows come from one relational expression—the targeted fix is Prefer an inline TVF where composability and execution plan behavior are appropriate. A successful test should show: The TVF joins efficiently to callers and returns correct results across parameter values.

Incorrect Answers

A:

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 developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

B:

Stored procedures support parameterized transactional operations and shared business enforcement. But that technique does not solve the stated problem—A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

D:

Database constraints serialize integrity under concurrency where check-then-write application logic can race. But that technique does not solve the stated problem—A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The needed intervention is Prefer an inline TVF where composability and execution plan behavior are appropriate.

Question 156

A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. What measurement or test best demonstrates that the requirement is satisfied?

  1. The TVF joins efficiently to callers and returns correct results across parameter values.
  2. The batch returns the same totals with lower CPU time on representative volumes.
  3. Concurrent calls each receive the identifier from their own insert.
  4. Exactly one latest ticket is selected per customer, including tie cases.

Explanation

Correct Answer

A:

Inline TVFs can be expanded into the caller's plan and avoid unnecessary procedural materialization. The observation “The TVF joins efficiently to callers and returns correct results across parameter values” directly confirms the chosen action worked for this situation: A developer plans a complex multi-statement TVF even though the required rows come from one relational expression.

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 developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

C:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. This observation would not establish that the required result occurred for A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

D:

A ranking window supports groupwise top-1 selection when order and tie-breakers are explicit. This observation would not establish that the required result occurred for A developer plans a complex multi-statement TVF even though the required rows come from one relational expression. The confirming test is: The TVF joins efficiently to callers and returns correct results across parameter values.

Question 157

A stored procedure must return the newly created record identifier to a caller. What is the most defensible next technical action?

  1. Implement narrow database-side enforcement with a constraint or trigger matched to the state-dependent rule.
  2. Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.
  3. Create a view with the required SELECT and grant access appropriately.
  4. Use ROW_NUMBER partitioned by customer ordered by time descending and stable event ID, then filter row number 1.

Explanation

Correct Answer

B:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. For the described situation—A stored procedure must return the newly created record identifier to a caller—the targeted fix is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism. A successful test should show: Concurrent calls each receive the identifier from their own insert.

Incorrect Answers

A:

State-dependent protections need carefully tested enforcement; triggers must handle statement sets and errors. But that technique does not solve the stated problem—A stored procedure must return the newly created record identifier to a caller. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

C:

A standard view stores query definition rather than a separately refreshed result set. But that technique does not solve the stated problem—A stored procedure must return the newly created record identifier to a caller. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

D:

A ranking window supports groupwise top-1 selection when order and tie-breakers are explicit. But that technique does not solve the stated problem—A stored procedure must return the newly created record identifier to a caller. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

Question 158

A stored procedure must return the newly created record identifier to a caller. Which result distinguishes a successful implementation from a cosmetic change?

  1. Concurrent calls each receive the identifier from their own insert.
  2. A hostile quote-containing test is treated as data and does not alter SQL structure.
  3. An attempted update of approved records is rejected with a clear error while draft edits remain possible.
  4. The inserted rows map each JSON element into typed fields with validation.

Explanation

Correct Answer

A:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. The observation “Concurrent calls each receive the identifier from their own insert” directly confirms the chosen action worked for this situation: A stored procedure must return the newly created record identifier to a caller.

Incorrect Answers

B:

Parameterized dynamic SQL separates values from executable statements and reduces injection risk. This observation would not establish that the required result occurred for A stored procedure must return the newly created record identifier to a caller. The confirming test is: Concurrent calls each receive the identifier from their own insert.

C:

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 A stored procedure must return the newly created record identifier to a caller. The confirming test is: Concurrent calls each receive the identifier from their own insert.

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 stored procedure must return the newly created record identifier to a caller. The confirming test is: Concurrent calls each receive the identifier from their own insert.

Question 159

A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. Which solution is the most appropriate for the scenario?

  1. Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.
  2. Create a view with the required SELECT and grant access appropriately.
  3. Use an INSTEAD OF trigger where supported to implement the intended view-write translation.
  4. Use an authorized Fabric lakehouse MCP endpoint with least-privilege metadata scope.

Explanation

Correct Answer

A:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. For the described situation—A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row—the targeted fix is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism. A successful test should show: Concurrent calls each receive the identifier from their own insert.

Incorrect Answers

B:

A standard view stores query definition rather than a separately refreshed result set. But that technique does not solve the stated problem—A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

C:

INSTEAD OF logic replaces the direct DML action; AFTER logic runs after a supported modification. But that technique does not solve the stated problem—A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

D:

Fabric MCP tooling is a controlled integration boundary, not blanket cross-workspace authorization. But that technique does not solve the stated problem—A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The needed intervention is Return the inserted key via OUTPUT inserted or a suitable scope-aware identity mechanism.

Question 160

A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. What should a technical reviewer verify before approving completion?

  1. A forced constraint error rolls back the unit of work and reaches the caller.
  2. Unit tests confirm one value per supported argument combination without hidden mutations.
  3. Equal scores share the same rank and the next rank reflects skipped positions.
  4. Concurrent calls each receive the identifier from their own insert.

Explanation

Correct Answer

D:

MAX(Id) is unsafe for concurrent identity retrieval; OUTPUT ties returned keys to the statement. The observation “Concurrent calls each receive the identifier from their own insert” directly confirms the chosen action worked for this situation: A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row.

Incorrect Answers

A:

Suppressing SQL errors conceals failed transactions; THROW propagates a meaningful failure. This observation would not establish that the required result occurred for A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The confirming test is: Concurrent calls each receive the identifier from their own insert.

B:

A scalar function encapsulates a single-result expression, not a full transaction workflow. This observation would not establish that the required result occurred for A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The confirming test is: Concurrent calls each receive the identifier from their own insert.

C:

RANK leaves gaps after ties while DENSE_RANK does not. This observation would not establish that the required result occurred for A web service inserts a transaction and then performs a nontransactional SELECT MAX(Id) that sometimes returns another user's row. The confirming test is: Concurrent calls each receive the identifier from their own insert.

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