Does the solution meet the goal?

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.

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You have a database that tracks orders and deliveries for customers in North America.

The database contains the following tables:

Sales.Customers

Application.Cities

Sales.CustomerCategories

The company’s development team is designing a customer directory application. The application must list customers by the area code of their phone number. The area code is defined as the first three characters of the phone number.

The main page of the application will be based on an indexed view that contains the area and phone number for all customers.

You need to return the area code from the PhoneNumber field.

Solution: You run the following Transact-SQL statement:

Does the solution meet the goal?
A . Yes
B . No

View Answer

Answer: A

Explanation:

The following indicates a correct solution:

– The function returns a nvarchar(10) value.

– Schemabinding is used.

– SELECT TOP 1 … gives a single value

Note: nvarchar(max) is correct statement.

nvarchar [ ( n | max ) ]

Variable-length Unicode string data. n defines the string length and can be a value from 1 through 4,000. max indicates that the maximum storage size is 2^31-1 bytes (2 GB).

References:

https://docs.microsoft.com/en-us/sql/t-sql/data-types/nchar-and-nvarchar-transact-sql

https://sqlstudies.com/2014/08/06/schemabinding-what-why/