You use Microsoft SQL Server 2012 to develop a database application. You need to implement a computed column that references a lookup table by using an INNER JOIN against another table.
What should you do?
A. Reference a user-defined function within the computed column.
B. Create a BEFORE trigger that maintains the state of the computed column.
C. Add a default constraint to the computed column that implements hard-coded values.
D. Add a default constraint to the computed column that implements hard-coded
CASE statements.
Explanation:
A common way to define a computed column is by using a user-defined function (UDF) to encapsulate the calculation logic.
References: https://blogs.msdn.microsoft.com/sqlcat/2011/11/28/a-computed-column-defined-with-a-user-defined-function-might-impact-query-performance/