# finding max time in calculations

I need to find the max time difference between two times.
I am getting an aggregate error.
``````SELECT CLE_IDX_CHAN, COUNT(CLE_IDX_OFFHOOK) ''Call Count'', SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)) ''Seconds'',
CONVERT(VARCHAR(12),DATEADD(ss, AVG(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) ''Avg Length'',
CONVERT(VARCHAR(12),DATEADD(ss, SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) ''Total Length'',
MAX(CONVERT(VARCHAR(12),DATEADD(ss, SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) )
FROM CL_EVENTS_IDX WITH (NOLOCK)
INNER JOIN CL_EVENTS A WITH (NOLOCK) ON CLE_IDX_KEY = CLE_ID
INNER JOIN UTILITY_INFO WITH (NOLOCK) ON CLE_IDX_UCODE = UTILITY_KEY
INNER JOIN CL_EVENTS B WITH (NOLOCK) ON A.CLE_ID = B.CLE_ID AND A.CLE_CALLID = B.CLE_CALLID
INNER JOIN CL_APPID_XREF WITH (NOLOCK) on A.CLE_EVID = CLX_APPID
WHERE A.CLE_TYPE = 508 AND B.CLE_TYPE = 536 and a.CLE_EVID = b.CLE_EVID
AND (A.CLE_EVID = 1 OR  A.CLE_EVID = 13)
Group BY CLE_IDX_CHAN
``````
###### Who is Participating?

Senior DBACommented:
Hi ,

Try this:
``````select
cs.CLE_IDX_CHAN
, cs.callcount as 'Call Count'
, cs.seconds as seconds
, convert( varchar( 12 ), dateadd( ss, cs.AvgLength, 0 ), 8 ) as 'Average Length'
, convert( varchar( 12 ), dateadd( ss, cs.seconds, 0 ), 8 ) as 'Total Length'
, convert( varchar( 12 ), dateadd( ss, cs.MaxLength, 0 ), 8 ) as 'Max Length'
from (
SELECT
CLE_IDX_CHAN
, COUNT(CLE_IDX_OFFHOOK) 'CallCount'
, SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)) 'Seconds'
, AVG(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)) 'AvgLength'
, max( datefidd( ss, cle_idx_offhook, cle_idx_onhook )) 'MaxLength'
FROM CL_EVENTS_IDX WITH (NOLOCK)
INNER JOIN CL_EVENTS A WITH (NOLOCK)
ON CLE_IDX_KEY = CLE_ID
INNER JOIN UTILITY_INFO WITH (NOLOCK)
ON CLE_IDX_UCODE = UTILITY_KEY
INNER JOIN CL_EVENTS B WITH (NOLOCK)
ON A.CLE_ID = B.CLE_ID
AND A.CLE_CALLID = B.CLE_CALLID
and a.CLE_EVID = b.CLE_EVID
INNER JOIN CL_APPID_XREF WITH (NOLOCK)
on A.CLE_EVID = CLX_APPID
WHERE
A.CLE_TYPE = 508
AND B.CLE_TYPE = 536
AND (A.CLE_EVID = 1 OR  A.CLE_EVID = 13)
Group BY
CLE_IDX_CHAN
) cs
;
``````

What I've done:
Moved a line from the where clause to the join of cl_events
Moved the converts to varchar etc to an outer query
Left an inner query with the group by

HTH
David

PS If you'd like it tested, please provide test data
0

Commented:
The two lines beginning with CONVERT are not valid aggregations for a group by statement:

CONVERT(VARCHAR(12),DATEADD(ss, AVG(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) ''Avg Length'',
0

Author Commented:
Those are not giving me an issue. It is when I add the

`````` MAX(CONVERT(VARCHAR(12),DATEADD(ss, SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) )
``````

Line that I begin to get the problem.
0

Commented:
<I am getting an aggregate error.>
please post the error
0

Senior DBACommented:
>> Line that I begin to get the problem.
MAX(CONVERT(VARCHAR(12),DATEADD(ss, SUM(DATEDIFF(ss, CLE_IDX_OFFHOOK, CLE_IDX_ONHOOK)), CAST(0 AS DATETIME)),8) ) <<

You can't do a MAX() of a SUM() in SQL Server; you can't embed any of the aggregate functions within each other.
0
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