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Why is this SELECT invalid?

In the query below, b.mydateutc triggers this error:

Column 'tickets.mydateutc' is invalid in the select list because it is not contained in either and aggregate function or the GROUP BY clause.

How do I resolve this?
select dateadd(day, 0, datediff(day, 0, b.mydateutc)) mydate,
count(b.ticketid), b.empid
from temp1 a inner join tickets b
on a.ticketid = b.ticketid
and a.ticketsessionid = b.ticketsessionid

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brettr
Asked:
brettr
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2 Solutions
 
Ephraim WangoyaCommented:
you need a group by clause
select dateadd(day, 0, datediff(day, 0, b.mydateutc)) mydate,
count(b.ticketid), b.empid
from temp1 a inner join tickets b on a.ticketid = b.ticketid and a.ticketsessionid = b.ticketsessionid
grouo by b.empid

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brettrAuthor Commented:
Unless you've changed something else in the query, which it doesn't seem you have, I'm still getting the same error.
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Ephraim WangoyaCommented:
You need to group by all fields in the select list including the date one

select dateadd(day, 0, datediff(day, 0, b.mydateutc)) mydate,
count(b.ticketid), b.empid
from temp1 a inner join tickets b on a.ticketid = b.ticketid and a.ticketsessionid = b.ticketsessionid
grouo by b.empid,  ateadd(day, 0, datediff(day, 0, b.mydateutc))
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brettrAuthor Commented:
Thanks.  That works.

There are some additional columns I want added to the SELECT so I can identify these rows in the result set.  But that means I have to also add them to the GROUP BY.  Will those new columns affect the result set?  Or, is there a way to output additional attributes without affecting the result set?
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Anthony PerkinsCommented:
>>Will those new columns affect the result set? <<
Yes, it could.
>>Or, is there a way to output additional attributes without affecting the result set? <<
Yes you can, but it depends on your requirements.  For example, the simplest way is to add MIN or MAX to the new columns.  But there are other more sophisticated methods.
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brettrAuthor Commented:
But there are other more sophisticated methods.

Can you provide some references to these?

Seems MIN and MAX would affect the result set and probably shouldn't be used for columns that should be benign (displayed only).
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Anthony PerkinsCommented:
>>Can you provide some references to these?<<
There are at least a couple of ways and I am sure there are more:
You can use a CTE with ROW_NUMBER() or RANK() or DENSE_RANK() to include the "first" row in the resultset.
You can use a derived table to filter the resultset based on the values returned in that derived table.

>>Seems MIN and MAX would affect the result set and probably shouldn't be used for columns that should be benign (displayed only). <<
MIN and MAX have no effect whatsoever on the number of rows output.
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