Question

即使存在表格，也会出现此错误

select count(eventguest.memberid) + x as total, eventid
from (
    select count(eventmember.memberid) as X, eventmember.eventid
    from eventmember
    group by eventid
)
inner join eventguest on eventmember.eventid = eventguest.eventid
group by eventid

ORA-00904：“ EVENTMEMBER”。“ EVENTID”：无效的标识符   00904. 00000-“％s：无效的标识符”   *原因：
  *行动：   行错误：16列：15

Answer 1

以下查询应正常工作：

SELECT Count(eventguest.memberid) + x AS total, 
    Y.eventid 
FROM   
(
 SELECT Count(eventmember.memberid) AS X, 
       eventmember.eventid 
 FROM   eventmember 
 GROUP  BY eventid
) Y
INNER JOIN eventguest 
ON Y.eventid = eventguest.eventid 
GROUP  BY Y.eventid

00904。00000-“％s：无效标识符”错误

1 个答案: