在select-case語句中排序

Question

有沒有一種方法可以僅通過單列在select case語句中進行排序？ 只能說按城市升序。

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

您沒有考慮表和from / where子句的問題，但是假設s是您要查詢的表的別名，則可以使用與通常相同的方式使用order：

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;

校正后的城市