DP-900 Practice Question: Identify considerations for relational data on Azure
A company uses Azure SQL Database for a customer relationship management (CRM) application. The database has a table named Orders that stores order details. The company needs to ensure that the OrderDate column is automatically set to the current date and time when a new row is inserted, without any application-side logic. Which T-SQL construct should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DEFAULT constraint with GETDATE()
A DEFAULT constraint with GETDATE() automatically populates the OrderDate column with the current date and time on each insert, without requiring application-side logic. Option A is incorrect because a CHECK constraint enforces data integrity by validating conditions but does not provide default values. Option B is incorrect because a UNIQUE constraint ensures all values in a column are unique, not auto-populate dates. Option C is incorrect because a PRIMARY KEY constraint uniquely identifies each row and does not set default values.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CHECK constraint
Why it's wrong here
CHECK validates data but does not provide default values.
- ✗
UNIQUE constraint
Why it's wrong here
UNIQUE ensures no duplicates, not default values.
- ✗
PRIMARY KEY constraint
Why it's wrong here
PRIMARY KEY uniquely identifies rows, does not set default values.
- ✓
DEFAULT constraint with GETDATE()
Why this is correct
DEFAULT with GETDATE() automatically inserts current date/time.
Go deeper
Related to this question
Learn chapter
Data Roles and Core Concepts
Key term
Primary key
A primary key is a unique identifier for each record in a database table, ensuring that no two rows have the same value in that column.
Key term
Row
A row is a horizontal record in a database table that contains all the information about a single entity, like one customer or one product.
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