DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A text classifier counts repeated pattern matches rather than merely testing whether any occur
Which SQL design or implementation decision most directly addresses this requirement?
REGEXP_COUNT returns the number of matches, unlike a boolean REGEXP_LIKE or substring extraction.
RANK assigns tied rows the same rank and leaves gaps; DENSE_RANK does not leave gaps.
Window aggregates retain detail rows while computing group-level results, unlike GROUP BY which collapses rows.
A correlated subquery evaluates using the current outer-row key and may be optimized differently from explicit joins.
Incoming webhook payloads sometimes contain malformed JSON and cause downstream failures
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Checking JSON validity before promotion reduces malformed documents but does not replace application-level schema validation.
Graph tables represent relationships explicitly and support pattern matching, though ordinary relational joins remain valid for simple cases.
Nullability is a core schema invariant and should not be delegated solely to an API form.
Database check predicates reject invalid stored values regardless of which client sent the write.
An ETL bulk insert creates one audit record when it should record every inserted row
Which SQL design or implementation decision most directly addresses this requirement?
DML triggers run per statement and inserted/deleted can contain multiple rows; singleton assumptions cause data loss.
Views centralize a logical query definition without storing an independent copy of rows by default.
TVPs provide typed relational input for multirow procedure operations without ad hoc concatenated SQL.
Views can serve as a restricted interface but must be combined with appropriate permissions and row filtering.
A health application must prevent database administrators from viewing patient identifiers in plaintext
Which SQL design or implementation decision most directly addresses this requirement?
Always Encrypted keeps sensitive column values inaccessible to parties lacking client-side keys, unlike server-only encryption at rest.
Endpoint convenience does not replace user authentication and data access enforcement in API and SQL layers.
Secure enclaves can permit certain richer operations over encrypted data within an attested protected boundary.
Separating audit custody from operational administrators reduces the risk of tampering and premature deletion.
An assistant is issued a database credential with db_owner permission merely to inspect table shapes
Which SQL design or implementation decision most directly addresses this requirement?
Least privilege reduces the impact of prompt injection, mistaken tool calls and credential disclosure.
Natural-language prompts do not guarantee safe SQL, so explicit statement-level approval protects critical schema.
Instruction files can guide generated suggestions toward local style and safety expectations, but must still be reviewed.
Prompt injection in tool output must not grant new authority or override the application trust boundary.
An automated workflow must catch invalid SQL object dependencies before staging
Which SQL design or implementation decision most directly addresses this requirement?
Compilation catches many missing symbols and invalid references before a DACPAC is deployed.
Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.
A consistent schema artifact should be promoted while environment-specific values are provided securely at deployment.
Policy-enforced reviews prevent bypassing designated security and database approvers.
A database has emergency hotfixes that source control does not yet reflect
Which SQL design or implementation decision most directly addresses this requirement?
Schema drift is divergence between the target and the model; blind publish may remove legitimate hotfixes.
Branch and pull-request workflow supports review, traceability and controlled merging of schema changes.
CI/CD credentials are high-value attack targets and should not be stored in repository text.
Federated OIDC authentication limits reusable secret material while retaining policy-controlled authorization.
An AI application needs connector-based approvals and metadata updates after new source documents arrive
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Logic Apps coordinates cross-service actions and retries but does not eliminate the need for idempotency.
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
Embedding freshness requires detecting source changes and re-embedding only changed meaningful content.
High-entropy IDs and timestamps add noise to natural-language embeddings; structured filters handle them better.
A deployment pipeline needs dependencies to be explicit before changing referenced objects
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Schema binding prevents incompatible changes to referenced object definitions until the dependency is handled.
Uncontrolled trigger nesting can cause excess DML, recursion failures, and transactional contention.
Multistatement TVFs can introduce estimation and optimization limitations, so an inline form is preferred when expressive enough.
Procedure output parameters convey scalar results in addition to result sets and return status values.
A batch-loader needs a procedure to expose a single computed status indicator to its caller
Which SQL design or implementation decision most directly addresses this requirement?
Procedure output parameters convey scalar results in addition to result sets and return status values.
Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.
Uncontrolled trigger nesting can cause excess DML, recursion failures, and transactional contention.
DML triggers can observe affected rows for audit work, but should remain set-based and avoid large side effects.
An application expects country and status reference records across every deployment environment
Which SQL design or implementation decision most directly addresses this requirement?
Reference data needs source control and repeatable seed logic, not manual one-off production inserts.
Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.
SDK-style project definitions simplify consistent tooling and package references while preserving project build semantics.
Text merges may not produce semantically compatible database designs, requiring explicit conflict resolution.
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