sql server - SQL how to format time containing an aggregate or a subquery -


please help. having little bit of problem here , need figuring out. have query returns multiple rows , when try format time display following message...

msg 130, level 15, state 1, line 3 cannot perform aggregate function on expression containing aggregate or subquery.

here format used when error...

cast(sum(datediff(second, 0, entrytime)) / 3600 varchar(12)) + ':' +  right('0' + cast(sum(datediff(second, 0, entrytime)) / 60 % 60 varchar(2)), 2) + ':' +  right('0' + cast(sum(datediff(second, 0, entrytime)) % 60 varchar(2)), 2)

which when run in in query correct format like...

project name     total time aaa               0:00:19 bbb               0:00:04 ccc               6:00:06 ddd               16:05:52

but, can't seem figure out how format following query display time in manner...

select projname 'project name',         convert(varchar(10), sum(case when phone = 0 , research = 0                                       (datediff(second, 0, entrytime))                                   end)) [total time no pmre],         convert(varchar(10), sum(case when phone = 1 , research = 0                                       (datediff(second, 0, entrytime))                                   end)) [total time phone],         convert(varchar(10), sum(case when phone = 0 , research = 1                                       (datediff(second, 0, entrytime))                                  end)) [total time research],         convert(varchar(10), sum(datediff(second, 0, entrytime)) ) 'total time' worktime entrytime not null group projname

and following result...

project name  total time no pmre  total time phone  total time research  total time aaa           19                  null              null                 19 bbb           4                   null              null                 4 ccc           10800               7200              3606                 21606 ddd           57952               null              null                 57952

all of correct need in figuring out how format time display hrs:mins:secs... actually, don't need seconds, hours , minutes advice, help, pointing in right direction wonderful. thank you!

try:

with cte (select projname ,          sum(case when phone = 0 , research = 0 datediff(second, 0, entrytime) end) [total time no pmre],          sum(case when phone = 1 , research = 0 datediff(second, 0, entrytime) end) [total time phone],          sum(case when phone = 0 , research = 1 datediff(second, 0, entrytime) end) [total time research],          sum(datediff(second, 0, entrytime)) [total time]  worktime  entrytime not null  group projname) select projname [project name],         cast([total time no pmre] / 3600 varchar(12)) + ':'        + right('0' + cast([total time no pmre] / 60 % 60 varchar(2)), 2) + ':'        + right('0' + cast([total time no pmre] % 60 varchar(2)), 2) [total time no pmre],         cast([total time phone] / 3600 varchar(12)) + ':'        + right('0' + cast([total time phone] / 60 % 60 varchar(2)), 2) + ':'        + right('0' + cast([total time phone] % 60 varchar(2)), 2) [total time phone],         cast([total time research] / 3600 varchar(12)) + ':'        + right('0' + cast([total time research] / 60 % 60 varchar(2)), 2) + ':'        + right('0' + cast([total time research] % 60 varchar(2)), 2) [total time research],         cast([total time] / 3600 varchar(12)) + ':'        + right('0' + cast([total time] / 60 % 60 varchar(2)), 2) + ':'        + right('0' + cast([total time] % 60 varchar(2)), 2) [total time] cte

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