How do you print the day name given a day number in SQL Server 2005 using SQL commands?

Question

I want to be able to pass in a day number like 1, 2, 3 or 7 and it will return the day name like Sunday, Monday, Tuesday or Saturday. I know there is the option of using a <

Answer 1

CREATE FUNCTION dbo.udf_DayOfWeek(@dtDate DATETIME)
RETURNS VARCHAR(10)
AS
BEGIN
DECLARE @rtDayofWeek VARCHAR(10)
SELECT @rtDayofWeek = CASE DATEPART(weekday,@dtDate)
WHEN 1 THEN 'Sunday'
WHEN 2 THEN 'Monday'
WHEN 3 THEN 'Tuesday'
WHEN 4 THEN 'Wednesday'
WHEN 5 THEN 'Thursday'
WHEN 6 THEN 'Friday'
WHEN 7 THEN 'Saturday'
END
RETURN (@rtDayofWeek)
END
GO

-- Call this function like this:
SELECT dbo.udf_DayOfWeek(GETDATE()) AS DayOfWeek

orignally from : SQL SERVER – UDF – Get the Day of the Week Function