星期几

来源：http://www.cnblogs.com/kkun/archive/2011/08/17/2143002.html

SELECT

CASE (DATEPART(dw, GETDATE()) + @@DATEFIRST) % 7

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 0 THEN 'Saturday'

END AS DayOfWeekName

DayOfWeekName

-------------

Wednesday