Group by records by date - sql

Question

I am using SQL Server 2008 R2. I am having a database table like below :
+--+-----+---+---------+--------+----------+-----------------------+
|Id|Total|New|Completed|Assigned|Unassigned|CreatedDtUTC |
+--+-----+---+---------+--------+----------+-----------------------+
|1 |29 |1 |5 |6 |5 |2014-01-07 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|2 |29 |1 |5 |6 |5 |2014-01-07 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|3 |29 |1 |5 |6 |5 |2014-01-07 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|4 |30 |1 |3 |2 |3 |2014-01-08 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|5 |30 |0 |3 |4 |3 |2014-01-09 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|6 |30 |0 |0 |0 |0 |2014-01-10 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
|7 |30 |0 |0 |0 |0 |2014-01-11 06:00:00.000|
+--+-----+---+---------+--------+----------+-----------------------+
Now, I am facing a strange problem while grouping the records by CreatedDtUTC column.
I want the distinct records from this table. Here you can observe that the first three records are duplicates created at the same date time. I want the distinct records so I had ran the query given below :
SELECT Id, Total, New, Completed, Assigned, Unassigned, MAX(CreatedDtUTC)
FROM TblUsage
GROUP BY CreatedDtUTC
But it gives me error :
Column 'TblUsage.Id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
I also have tried DISTINCT for CreatedDtUTC column, but had given the same error. Can anyone let me know how to get rid of this?
P.S. I want the CreatedDtUTC coumn in CONVERT(VARCHAR(10), CreatedDtUTC,101) format.

Answer 1

Try this............
SELECT min(Id) Id, Total, New, Completed, Assigned, Unassigned, CreatedDtUTC
FROM TblUsage
GROUP BY Total, New, Completed, Assigned, Unassigned, CreatedDtUTC

Answer 2

The error message itself is very explicit. You can't put a column without applying an aggregate function to it into SELECT clause if it's not a part of GROUP BY. And the reason behind is very simple SQL Server doesn't know which value for that column within a group you want to select. It's not deterministic and therefore prohibited.
You can either put all the columns besides Id in GROUP BY and use MIN() or MAX() on Id or you can leverage windowing function ROW_NUMBER() in the following way
SELECT Id, Total, New, Completed, Assigned, Unassigned, CONVERT(VARCHAR(10), CreatedDtUTC,101) CreatedDtUTC
FROM
(
SELECT t.*, ROW_NUMBER() OVER (PARTITION BY Total, New, Completed, Assigned, Unassigned, CreatedDtUTC
ORDER BY id DESC) rnum
FROM TblUsage t
) q
WHERE rnum = 1
Output:
| ID | TOTAL | NEW | COMPLETED | ASSIGNED | UNASSIGNED | CREATEDDTUTC |
|----|-------|-----|-----------|----------|------------|--------------|
| 3 | 29 | 1 | 5 | 6 | 5 | 01/07/2014 |
| 6 | 30 | 0 | 0 | 0 | 0 | 01/10/2014 |
| 7 | 30 | 0 | 0 | 0 | 0 | 01/11/2014 |
| 5 | 30 | 0 | 3 | 4 | 3 | 01/09/2014 |
| 4 | 30 | 1 | 3 | 2 | 3 | 01/08/2014 |
Here is SQLFiddle demo

Answer 3

Try this:
SELECT MIN(Id) AS Id, Total, New, Completed, Assigned, Unassigned,
CONVERT(VARCHAR(10), CreatedDtUTC, 101) AS CreatedDtUTC
FROM TblUsage
GROUP BY Total, New, Completed, Assigned, Unassigned, CreatedDtUTC
Check the SQL FIDDLE DEMO
OUTPUT
| ID | TOTAL | NEW | COMPLETED | ASSIGNED | UNASSIGNED | CREATEDDTUTC |
|----|-------|-----|-----------|----------|------------|--------------|
| 1 | 29 | 1 | 5 | 6 | 5 | 01/07/2014 |
| 4 | 30 | 1 | 3 | 2 | 3 | 01/08/2014 |
| 5 | 30 | 0 | 3 | 4 | 3 | 01/09/2014 |
| 6 | 30 | 0 | 0 | 0 | 0 | 01/10/2014 |
| 7 | 30 | 0 | 0 | 0 | 0 | 01/11/2014 |