Question

您好，我来自Oracle世界，我对SQL Server没有太多经验。有人能告诉我为什么这个查询的内部部分不起作用？我尝试了不同的选项，似乎没有一个工作：

select EventType, sum(Executed), sum(TriggeredScenarios), sum(OpenAlerts),sum(TotalAlerts)
from (
      select id, 
            'myEvent' as [EventType],
             TriggeredScenarios,
             Executed,
                  TotalAlerts = (select sum(cnt) as [TotalCount] 
                                             -- it breaks from here 
                                             from (select count(*) as [cnt]
                                                            from [myAlert1] aa, [Alert] bb
                                                            where aa.EventType = EventType
                                                              and aa.EventId = id
                                                              and aa.AlertId = bb.id 
                                                              and bb.DetectionAlertType = 'myAlert1'
                                            -- until here 
                                            UNION 
                                            select count(*) as [cnt]
                                                            from [myAlert2] aa, [Alert] bb
                                                            where aa.EventType = EventType
                                                              and aa.EventId = id
                                                              and aa.AlertId = bb.id 
                                                              and bb.DetectionAlertType = 'myAlert2'
                                                      ) aa),
             OpenAlerts = (select sum(cnt) as [TotalAlerts] 
                                          from ( select count(*) as [cnt]
                                                      from [Alert] aa, [myAlert1] bb
                                                where aa.currentstateid not in (select intStateID 
                                                                                                   from _AlertStates 
                                                                                                   where strGroupName like (N'AlertsClosed%')
                                                                                                )
                                                      and bb.EventType = EventType
                                                and bb.EventId = id
                                                      and bb.AlertId = aa.id
                                                      and aa.DetectionAlertType = 'myAlert1' 
                                             UNION 
                                             select count(*) as [cnt]
                                                      from [Alert] aa, [myAlert2] bb
                                                where aa.currentstateid not in (select intStateID 
                                                                                                   from _AlertStates 
                                                                                                   where strGroupName like (N'AlertsClosed%')
                                                                                                )
                                                      and bb.EventType = EventType
                                                and bb.EventId = id
                                                      and bb.AlertId = aa.id
                                                      and aa.DetectionAlertType = 'myAlert2' 
                                                ) aa )              
         from [myEvent]
         where [Timestamp] >= '11/26/2012'
           AND [Timestamp] <  '11/27/2012'
      UNION
      select id, 
                  'myEvent2' as [EventType],
             TriggeredScenarios,
             Executed,
                  TotalAlerts = (select sum(cnt) as [TotalCount] 
                                             from (select count(*) as [cnt]
                                                            from [myAlert1] aa, [Alert] bb
                                                            where aa.EventType = EventType
                                                              and aa.EventId = id
                                                              and aa.AlertId = bb.id 
                                                              and bb.DetectionAlertType = 'myAlert1'
                                            UNION 
                                            select count(*) as [cnt]
                                                            from [myAlert2] aa, [Alert] bb
                                                            where aa.EventType = EventType
                                                              and aa.EventId = id
                                                              and aa.AlertId = bb.id 
                                                              and bb.DetectionAlertType = 'myAlert2'
                                                      ) aa),
             OpenAlerts = (select sum(cnt) as [TotalAlerts] 
                                          from ( select count(*) as [cnt]
                                                      from [Alert] aa, [myAlert1] bb
                                                where aa.currentstateid not in (select intStateID 
                                                                                                   from _AlertStates 
                                                                                                   where strGroupName like (N'AlertsClosed%')
                                                                                                )
                                                      and bb.EventType = EventType
                                                and bb.EventId = id
                                                      and bb.AlertId = aa.id
                                                      and aa.DetectionAlertType = 'myAlert1' 
                                             UNION 
                                             select count(*) as [cnt]
                                                      from [Alert] aa, [myAlert2] bb
                                                where aa.currentstateid not in (select intStateID 
                                                                                                   from _AlertStates 
                                                                                                   where strGroupName like (N'AlertsClosed%')
                                                                                                )
                                                      and bb.EventType = EventType
                                                      and bb.EventId = id
                                                      and bb.AlertId = aa.id
                                                      and aa.DetectionAlertType = 'myAlert2' 
                                                ) aa )              
         from [myEvent2]
         where [Timestamp] >= '11/26/2012'
           AND [Timestamp] <  '11/27/2012'
            )
group by EventName

请帮忙吗？

Answer 1

这是您标记为无效的部分：

select count(*) as [cnt]
from [myAlert1] aa, [Alert] bb
where aa.EventType = EventType and
      aa.EventId = id and
      aa.AlertId = bb.id and
      bb.DetectionAlertType = 'myAlert1'

首先，将连接条件放在where子句而不是on子句中是非常错误的形式。所以，让我把它重写为：

select count(*) as [cnt]
from [myAlert1] aa join
     [Alert] bb
     on aa.AlertId = bb.id
where aa.EventType = EventType and
      aa.EventId = id and
      bb.DetectionAlertType = 'myAlert1'

如上所述，这被“解释为”：

select count(*) as [cnt]
from [myAlert1] aa join
     [Alert] bb
     on aa.AlertId = bb.id
where aa.EventType = aa.EventType and  -- because there is no bb.EventType
      aa.EventId = bb.id and           -- because there is no aa.id
      bb.DetectionAlertType = 'myAlert1'

EventId和bb.Id之间的链接可能会阻止任何行返回 - 或者至少会减少行数。

我怀疑EventType和id是PL / SQL变量。如果是这样，这些将写成：

select count(*) as [cnt]
from [myAlert1] aa join
     [Alert] bb
     on aa.AlertId = bb.id
where aa.EventType = @EventType and
      aa.EventId = @id and
      bb.DetectionAlertType = 'myAlert1'

sql server查询无法正常工作

1 个答案: