DP-800 Premium File
- 101 Questions & Answers
- Last Update: Nov 12, 2026
A BI workload needs a narrow read surface without direct SELECT on base tables
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Views can serve as a restricted interface but must be combined with appropriate permissions and row filtering.
Scalar functions return one value and can encapsulate reusable calculation logic, but implementation choice may affect plan quality.
Inline TVFs return tabular results and can be optimized into the calling query, unlike a procedure result set.
Procedures encapsulate executable database workflows and accept parameters, but caller permissions and atomicity remain design concerns.
An investigation maps customer devices, account nodes and transfer edges to find two-hop relationships
Which SQL design or implementation decision most directly addresses this requirement?
Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.
Recursive CTEs traverse hierarchies by repeatedly combining results until no new rows are produced.
A ROWS frame specifies exactly which neighboring rows contribute, whereas default RANGE behavior may include peer rows.
THROW provides structured error propagation that callers can handle and prevents false-success status reporting.
An AI data pipeline must replay each insert and update with historical values
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
CDC captures historical change records from the log, unlike key-only change tracking.
Functions can process detected row changes automatically but require connection, concurrency and retry safeguards.
Incremental content tracking saves model calls and avoids rewriting vectors with no semantic change.
A fixed-dimensional vector column cannot store embeddings of an incompatible dimension without schema or model changes.
An organization chart must report every subordinate level beneath one manager
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Recursive CTEs traverse hierarchies by repeatedly combining results until no new rows are produced.
Correlated EXISTS performs an existence test and avoids multiplying outer rows for multiple qualifying matches.
Graph MATCH expresses edge relationships in a pattern rather than merely comparing flat key columns.
THROW provides structured error propagation that callers can handle and prevents false-success status reporting.
A code assistant offers multiple model choices with different output and data-handling policies
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Model choice affects capability and governance, and prompts must stay within the approved service boundary.
AI-assisted code generation does not waive data classification, retention and exposure restrictions.
Instruction files can guide generated suggestions toward local style and safety expectations, but must still be reviewed.
Grounded schema context helps prevent nonexistent objects but still requires verification of generated SQL.
A team manages schema changes as loose SQL scripts and versions drift between developers
Which SQL design or implementation decision most directly addresses this requirement?
SQL Database Projects represent schema as versioned declarative artifacts that can be built and validated.
Project references inform build-time symbol resolution and make schema dependencies explicit.
A successful compiler build is necessary but not sufficient for quality or secure schema changes.
Data and schema changes must be sequenced so new constraints do not break on preexisting invalid rows.
A new customer signup requires a default creation timestamp when the client omits one
Which SQL design or implementation decision most directly addresses this requirement?
A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.
Uniqueness for non-primary business attributes is enforced separately from the surrogate primary key.
Nullability is a core schema invariant and should not be delegated solely to an API form.
Sequences generate values independently of an individual table, unlike a column-specific identity, and can still exhibit gaps.
A query shows the correct SQL logic but its Sort has severe memory spill warnings
Which SQL design or implementation decision most directly addresses this requirement?
Actual plans reveal runtime statistics and costly operators that estimated plans alone may not expose.
Versioned read-committed isolation reduces reader/writer blocking but changes consistency semantics and tempdb/version-store demand.
Saving compute cost is not safe if CPU, IO or memory limits violate service-level objectives.
DMVs expose current and cumulative SQL diagnostics that help distinguish contention from capacity or query-plan issues.
A transactional table has frequent point lookups and no current clustered index
Which SQL design or implementation decision most directly addresses this requirement?
The clustered index organizes rowstore table data by key, affecting lookup and page-split costs; it should not be selected solely for uniqueness.
In-Memory OLTP reduces certain latch and lock bottlenecks but has feature and capacity constraints that require workload testing.
A default supplies a value when the insert omits the column; it does not override explicit invalid inputs or validate all states.
A predicate-limited index has fewer rows to maintain and can serve a matching selective WHERE clause.
A SQL application calls an external model through a stored procedure but the endpoint rejects long or invalid payloads
Which SQL design or implementation decision most directly addresses this requirement?
The stored procedure can call an external REST endpoint under its security/configuration limits; the caller must handle HTTP errors and quotas.
Data minimization reduces privacy exposure, inference risk and token costs without impairing the specific answer.
External network latency inside a transaction prolongs locks and increases deadlock and timeout exposure.
Source metadata supports provenance checks and keeps generated statements linked to authorized records.
Events arrive from branches in different time zones and audits need original offsets
After the team applies the intended design, which observation would most directly verify that the specific requirement was met?
Persisting an offset or normalized instant helps prevent ambiguity that occurs with unqualified local DATETIME values.
An indexed computed expression can make frequently queried JSON properties searchable instead of repeatedly parsing and scanning.
The selected range direction determines ownership of values equal to boundaries, which affects pruning and rollover.
Identity allocation can leave gaps after failures or caching, so it is inappropriate as a legal no-gap counter.
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