在SQL查詢where子句中使用多個值

Question

Select Distinct
  SomeDay.SomeDayID, SomeDay.FolderName, SomeDay.FolderColor
from
  SomeDay, SomeDayEvent
where
  SomeDay.SomeDayID != 4,3,2,1;

Answer 1

你不能使用!=為你應該使用多個值not in一樣：

Select Distinct 
    SomeDay.SomeDayID,SomeDay.FolderName,SomeDay.FolderColor 
from 
    SomeDay,SomeDayEvent 
where 
    SomeDay.SomeDayID not in (4,3,2,1);

Answer 2

您不能用逗號分隔WHERE部分中的值。 您必須使用IN或BETWEEN關鍵字。

SomeDay.SomeDayID NOT IN (1,2,3,4)

要么

SomeDay.SomeDayID NOT BETWEEN 1 AND 4

Answer 3

Select Distinct SomeDay.SomeDayID,SomeDay.FolderName,SomeDay.FolderColor from SomeDay,SomeDayEvent where SomeDay.SomeDayID NOT IN (4, 3, 2, 1)

使用IN子句。

Answer 4

SomeDayID是否SomeDayID空？ 你應該知道表達式

NULL NOT IN (1, 2, 3, 4)

不評估為TRUE。