Home » Microsoft » 70-762 » Which of the following two statements best describes an updatable view?
You have a database with multiple tables. You must insert data into the tables by using views.
Which of the following two statements best describes an updatable view?
NOTE: Each correct selection is worth one point.
A. The view must not include the primary key of the table.
B. The view may include GROUP BY or HAVING statements.
C. The view may include a composite field.
D. Each view must reference columns from one table.
E. The view must not include subqueries.
Correct Answer: BD
Explanation/Reference:
Explanation:
B: The columns being modified must not be affected by GROUP BY, HAVING, or DISTINCT clauses.
D: Any modifications, including UPDATE, INSERT, and DELETE statements, must reference columns from only one base table.
Incorrect Answers:
A: Primary keys are allowed.
C: The columns cannot be derived in any other way, such as through the following:
A computation. The column cannot be computed from an expression that uses other columns.
E: The restrictions apply to any subqueries in the FROM clause of the view, just as they apply to the view itself.
References:
https://docs.microsoft.com/en-us/sql/t-sql/statements/create-view-transact-sql?view=sql-server-2017
