Question

查找那些eventId的所有行的结果，其中对于具有特定位置和子位置的eventId存在一行，但是不存在具有该位置和空子位置的任何行。我使用EXCEPT关键字在MS SQL中完成了它;但是，MS Access在EXCEPT上失败。有没有办法在MS Access中执行此查询：

 SELECT Distinct  eventID FROM table   WHERE Position = '123' AND SubPosition = 'ABC'
 AND pool = 'something'
 AND Status = 'active'
 AND area = '1'
 EXCEPT
 SELECT Distinct  eventID FROM table   WHERE Position = '123' AND SubPosition  IS NULL
 AND pool = 'something'
 AND Status = 'active'
 AND area = '1'

由于

Answer 1

沿着外部联接的行找到没有空匹配的位置，然后过滤没有空匹配。

SELECT  *
FROM (select * from Table1 where subposition is not null) as hasSubPosition
left join (select * from Table1 where subposition is null) AS noSubPosition
on 
hasSubPosition.eventid = noSubPosition.eventid and
hasSubPosition.position = noSubPosition.position and
hasSubPosition.pool = noSubPosition.pool and
hasSubPosition.status = noSubPosition.status and
hasSubPosition.area = noSubPosition.area
where noSubPosition.eventid is null

MS Access - 替代使用相同表除外

1 个答案: