💎SQL Reloaded: Deterministic Functions (GetDate SQL Server 2000/2005)

In an answer on LinkedIn, one of the users made me attentive that in SQL Server 2005 and later versions the GetDate() and other non-deterministic UDFs (user-defined functions) can be used inside functions and views, thing which was not possible under SQL Server 2000. This lack of functionality involved considerable overhead when was needed to use current date in table-valued functions. The solution was to send the date as parameter to the respective objects.     

For exemplification the following piece of code would run successfully on SQL Server 2005 but fail on SQL Server 2000, returning the below error message. 

-- creating the test function
CREATE FUNCTION dbo.fGetCurrentDate() 
RETURNS smalldatetime AS 
BEGIN 
    RETURN GetDate()
END

-- testing the function
SELECT dbo.fGetCurrentDate() 

Error message:
Server: Msg 443, Level 16, State 1, Procedure GetCurrentDate, Line 6 Invalid use of 'getdate' within a function.

A similar error message resulted when using the GetDate() function inside of a view:

-- creating the test view
CREATE VIEW dbo.vGetCurrentDate
AS
SELECT GetDate() AS CurrentDate

-- testing the view
SELECT * 
FROM dbo.vGetCurrentDate

The alternative was to use an UDF instead, which functions like a parameterized view, something like:

-- creating the test UDF
CREATE FUNCTION dbo.udfFilterByDate(
 @date datetime)
 RETURNS TABLE
 AS 
 RETURN(
 SELECT * 
 FROM [AdventureWorks2014].Production.Product
 WHERE [SellStartDate]>=@Date)

 -- testing the UDF
 SELECT *
 FROM dbo.udfFilterByDate(GetDate())

 -- testing the UDF (alternative)
 DECLARE @date as datetime
 SET @date = GetDate()
 SELECT *
 FROM dbo.udfFilterByDate(@date)

Using an UDF can still be necessary when is needed to pass dates and other types of parameters used inside of a correlated query or within the logic.