Count函数返回null

Question

我遇到count函数的问题，其中count函数返回空值

我有四张桌子

1. 控件（ruid，ratc_id，raw_value，value，min，max，translate_id，unit，monitor，changed）
2. 事件（ruid，event_id，min，max，current_status，previous_status）
3. event_log（ruid，event_id，raw_value，TIMESTAMP）
4. 显示器

我遇到了count函数的问题。这是我的代码的一部分

create temp table Testing_table as

select event_log.[ruid] as ruid, event_log.[raw_value] as raw_value, event_log.[event_id] as event_id, event_log.[timestamp] as timestamp, count ('Test_ID') as 'Test_ID', null as 'Test Result'
from event_log
JOIN controls
on event_log.[ruid] = controls.[ruid]
and event_log.[raw_value] = controls.[raw_value]
UNION
select
ruid, raw_value, event_id, timestamp, null as 'Test_ID',

CASE 
when raw_value = 0.9343453535635 then 'Pass'
when raw_value = 0.04583743847 then 'Pass'
when raw_value = 0.563363656757 then 'Pass'
when raw_value = 0.6666666666 then 'Pass'
when raw_value = 0.65757447777 then 'Pass'
when raw_value = 0.9267482727372 then 'Pass'

when raw_value = 0.2323239945454 then 'Pass'
when raw_value = 0.9732746367437 then 'Pass'
when raw_value = 0.0222222222222 then 'Pass'
when raw_value = 0.5656857676747 then 'Pass'
when raw_value = 0.6546456363563 then 'Pass'
when raw_value = 0.0348343874738 then 'Pass'
when raw_value = 0.9457458745737 then 'Pass'

when raw_value = 0.543452434345 then 'Pass'
when raw_value = 0.9836438454522 then 'Pass'
when raw_value = 0.2546456745635 then 'Pass'
when raw_value = 0.0456474635353 then 'Pass'
when raw_value = 0.9454545454256 then 'Pass'
when raw_value = 0.0456474635353 then 'Pass'
when raw_value = 0.4536465665635 then 'Pass'
when raw_value = 0.4536465665635 then 'Pass'
when raw_value = 0.4545465752726 then 'Pass'

when ruid = 2 then 'Not in events_log'
when ruid = 4 then 'Not in events_log'

else 'Failed'

end 
 as 'Test Result'
 from event_log;
 select * from Testing_table;

以下是查询结果：

ruid    raw_value   event_id    timestamp        Test_ID     Test Result 
1   0.04583743847   1   2014-03-06 13:33:52.187  <null>         Pass
1   0.563363656757  1   2014-03-06 13:33:52.187  <null>         Pass
1   0.9267482727372 1   2014-03-06 13:33:52.187  <null>         Pass
3   0.0222222222222 2   2014-03-06 13:33:52.187  <null>         Pass
3   0.0348343874738 2   2014-03-06 13:33:52.187  <null>         Pass
3   0.2323239945454 2   2014-03-06 13:33:52.187  <null>         Pass 
3   0.5656857676747 2   2014-03-06 13:33:52.187  <null>         Pass
3   0.9457458745737 2   2014-03-06 13:33:52.187  <null>         Pass
3   0.9457458745737 2   2014-03-06 13:33:52.187  2          <null>
3   0.9732746367437 2   2014-03-06 13:33:52.187  <null>         Pass
5   0.0456474635353 3   2014-03-06 13:33:52.187  <null>         Pass
5   0.2546456745635 3   2014-03-06 13:33:52.187  <null>         Pass
5   0.4536465665635 3   2014-03-06 13:33:52.187  <null>         Pass
5   0.9454545454256 3   2014-03-06 13:33:52.187  <null>         Pass
5   0.9836438454522 3   2014-03-06 13:33:52.187  <null>         Pass

如何让Test_ID列每行加一个？

希望这一切都有意义。