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Nested SELECT with DatePart join

Nested SELECT with DatePart join

Nested SELECT with DatePart join


I'm trying to run a nested query that will extract for each date a count on certain variables.  I'm hoping to get something like this:
TheYear, TheMonth, TheDay, count(Variable=whatever1), count(Variable=whatever2), etc...

Below is a much simplified version of what I'm trying to accomplish:

'TheDay' = DatePart(d, TB1.DateStamp),
'Variable1' = (
    select count(TB2.ID)
    from TableName TB2
    where Variable1 = 'whatever' and
    DatePart(d, TB2.DateStamp) = DatePart(d, TB1.DateStamp)
from     TableName TB1
group by DatePart(d, TB1.DateStamp)

Unfortunately I keep getting this error:
Server: Msg 8630, Level 17, State 38, Line 1
Internal Query Processor Error: The query processor encountered an unexpected error during execution.

I know the larger select works without the nested selects, and I know the nested select works when not included in the larger statement and I use hard coded numbers (e.g. DatePart(d, TB1.DateStamp) is replaced by 8 for example)...

So what am I doing wrong?!?!

Any suggestions would be great!


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