Joining two queries into one - sql

Question

I have two working queries. Query 1 performs a filter on a large table and returns exactly the data that I need, it looks like this:
/****** QUERY #1 - This query will filter the data ******/
SELECT [WacnId],
[StartDT]
,[EndDT]
,[Group]
,[ID_Agency]
,[TargetUnit_Agency],
case [Group]
when 1 then 'in'
when 0 then 'out'
end as traffic
FROM [GW_20140315].[dbo].[ARC_Calls_ReportView]
WHERE [GroupDisplayID] = 'T802149' OR [ID_Agency] = 'Dispatch' or [TargetUnit_Agency] = 'Dispatch'
order by StartDT
Query #2 acts on the filtered data from Query 1 and produces a 1/2 hourly report. Query 2 looks like this:
/******Query #2- This query will take the filtered data and process it as needed ******/
SELECT dateadd(mi, (datediff(mi, 0, StartDT) / 30) * 30, 0) as HalfHour
, sum(DATEDIFF ( s , [StartDT] , [EndDT] )) as [Total Time (Seconds)],
SUM(CASE WHEN [TargetUnit_Agency] = 'Dispatch' then 1 ELSE 0 END ) AS InCount,
SUM(CASE WHEN [ID_Agency] = 'Dispatch' then 1 ELSE 0 END ) AS OutCount
FROM [Radio].[dbo].[Filter_Data]--This is how I did it before, but now I want to combine the two queries
GROUP BY dateadd(mi, (datediff(mi, 0, StartDT) / 30) * 30, 0)
ORDER BY 1
How may I combine these two queries into one?

Answer 1

You may use a CTE to describe your filtered data (first query) and then query using the CTE as your main table (second query):
;WITH FilteredCTE AS
(
SELECT [WacnId],
[StartDT]
,[EndDT]
,[Group]
,[ID_Agency]
,[TargetUnit_Agency],
case [Group]
when 1 then 'in'
when 0 then 'out'
end as traffic
FROM [GW_20140315].[dbo].[ARC_Calls_ReportView]
WHERE [GroupDisplayID] = 'T802149'
OR [ID_Agency] = 'Dispatch'
or [TargetUnit_Agency] = 'Dispatch'
)
SELECT dateadd(mi, (datediff(mi, 0, StartDT) / 30) * 30, 0) as HalfHour,
sum(DATEDIFF ( s , [StartDT] , [EndDT] )) as [Total Time (Seconds)],
SUM(CASE WHEN [TargetUnit_Agency] = 'Dispatch' then 1 ELSE 0 END ) AS InCount,
SUM(CASE WHEN [ID_Agency] = 'Dispatch' then 1 ELSE 0 END ) AS OutCount
FROM FilteredCTE
GROUP BY dateadd(mi, (datediff(mi, 0, StartDT) / 30) * 30, 0)
ORDER BY StartDT

Answer 2

Just select Query1 FROM Query2:
SELECT Dateadd(mi, ( Datediff(mi, 0, startdt) / 30 ) * 30, 0) AS HalfHour,
Sum(Datediff (s, [startdt], [enddt])) AS
[Total Time (Seconds)],
Sum(CASE
WHEN [targetunit_agency] = 'Dispatch' THEN 1
ELSE 0
end) AS InCount,
Sum(CASE
WHEN [id_agency] = 'Dispatch' THEN 1
ELSE 0
end) AS OutCount
FROM (SELECT [wacnid],
[startdt],
[enddt],
[group],
[id_agency],
[targetunit_agency],
CASE [group]
WHEN 1 THEN 'in'
WHEN 0 THEN 'out'
end AS traffic
FROM [GW_20140315].[dbo].[arc_calls_reportview]
WHERE [groupdisplayid] = 'T802149'
OR [id_agency] = 'Dispatch'
OR [targetunit_agency] = 'Dispatch'
ORDER BY startdt)
GROUP BY Dateadd(mi, ( Datediff(mi, 0, startdt) / 30 ) * 30, 0)
ORDER BY 1