在select - case語句中排序

Question

是否有一種方法僅在單個列的select case語句中進行排序？讓我們只能說在城市上升的順序。

SELECT 
StudentLocation = 
CASE 
    WHEN @IsRegistered IS NOT NULL AND @IsInClass IS NOT NULL THEN s.InClassLocation 
    WHEN @IsRegistered IS NOT NULL AND @IsInClass IS NULL THEN s.OnlineLocation 
    ELSE s.City + ', ' + s.State 
END 

Answer 1

你忽略了你的問題的表和/ where子句，但假設s是一個別名你查詢的表，你可以使用順序相同的方式，你總是做到這一點：

SELECT 
StudentLocation = 
CASE 
    WHEN @IsRegistered IS NOT NULL AND @IsInClass IS NOT NULL THEN s.InClassLocation 
    WHEN @IsRegistered IS NOT NULL AND @IsInClass IS NULL THEN s.OnlineLocation 
    ELSE s.City + ', ' + s.State 
END 
FROM someTable as s 
ORDER BY s.City ASC; 

更正市