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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

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).

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/