如何在sql case語句中使用datename

Question

如何使用case語句確定當前日期是星期六，星期日還是星期幾？我已經嘗試了以下所以任何指針我要去哪裏錯將不勝感激。謝謝。

SELECT * FROM mytable WHERE day = (SELECT CASE aday 
             WHEN DATENAME(dw, GETDATE()) = 'Saturday' THEN 'Sat' 
             WHEN DATENAME(dw, GETDATE()) = 'Sunday' The 'Sun' 
             ELSE 'Weekday'); 

Answer 1

SELECT * FROM mytable WHERE day = (
    SELECT CASE DAYNAME(aday) 
     WHEN 'Saturday' THEN 'Sat' 
     WHEN 'Sunday' THEN 'Sun' 
     ELSE 'Weekday' END 
) 
;