SQL Query to View - sql

Question

I am trying to turn the following query into a view, however I receive the following execution error:
Can anyone pinpoint where I am going wrong?
Should look like:
Financial Year VOLUME # Cases 5mins # Cases 10mins # Cases 15mins # Cases 20mins
2014/15 1490200 1029 6732 10163 11798
2015/16 1548700 1143 7286 10693 12338
etc...
Code:
SELECT t1.[Financial Year], t1.[VOLUME], t2.[# Cases 5mins], t3.[# Cases 10mins], t4.[# Cases 15mins], t5.[# Cases 20mins]
FROM
(SELECT [Financial Year], CAST(COUNT([Event Number]) AS DECIMAL) *100 as 'VOLUME' FROM tblCAD
WHERE [AO-NonPublicEvent] = 1 AND [Reporting Exclusions] = 0 AND [Reporting Priority] = '1'
GROUP BY [Financial Year]) t1
left join
(SELECT [Financial Year], CAST(COUNT([Event Number]) AS DECIMAL) as '# Cases 5mins' from tblCAD
WHERE [AO-NonPublicEvent] = 1 AND [Reporting Exclusions] = 0 AND CAST([Response Time] AS DECIMAL(9,2))/60 <= 5 AND [Reporting Priority] = '1'
GROUP BY [Financial Year]) t2
ON (t1.[Financial Year] = t2.[Financial Year])
left join
(SELECT [Financial Year], CAST(COUNT([Event Number]) AS DECIMAL) as '# Cases 10mins' from tblCAD
WHERE [AO-NonPublicEvent] = 1 AND [Reporting Exclusions] = 0 AND CAST([Response Time] AS DECIMAL(9,2))/60 <= 10 AND [Reporting Priority] = '1'
GROUP BY [Financial Year]) t3
on (t1.[Financial Year] = t3.[Financial Year])
left join
(SELECT [Financial Year], CAST(COUNT([Event Number]) AS DECIMAL) as '# Cases 15mins' from tblCAD
WHERE [AO-NonPublicEvent] = 1 AND [Reporting Exclusions] = 0 AND CAST([Response Time] AS DECIMAL(9,2))/60 <= 15 AND [Reporting Priority] = '1'
GROUP BY [Financial Year]) t4
on (t1.[Financial Year] = t4.[Financial Year])
left join
(SELECT [Financial Year], CAST(COUNT([Event Number]) AS DECIMAL) as '# Cases 20mins' from tblCAD
WHERE [AO-NonPublicEvent] = 1 AND [Reporting Exclusions] = 0 AND CAST([Response Time] AS DECIMAL(9,2))/60 <= 20 AND [Reporting Priority] = '1'
GROUP BY [Financial Year]) t5
on (t1.[Financial Year] = t5.[Financial Year])

Answer 1

I'm not sure why your code isn't working. But it can be significantly simplified using conditional aggregation and then it will probably work:
SELECT [Financial Year],
COUNT(*) * 100 as VOLUME,
SUM(CASE WHEN CAST([ Response Time ] AS DECIMAL(9, 2)) / 60 <= 5 THEN 1 ELSE 0 END) as within_5_minutes,
SUM(CASE WHEN CAST([ Response Time ] AS DECIMAL(9, 2)) / 60 <= 10 THEN 1 ELSE 0 END) as within_10_minutes,
. . .
FROM tblCAD
WHERE [AO-NonPublicEvent] = 1 AND
[Reporting Exclusions] = 0 AND
[Reporting Priority] = '1'
GROUP BY [Financial Year];
Note that you should fix your column names so they don't need to be escaped. I would suggest something like Fiscal_Year, AO_NonPublic_Event, Reporting_Exclusions, and so on.
I'm also not sure why you are multiplying the first count by 100. And the above assumes that [Event Number] is not NULL. If that is the case, then you need to take that into account.