This latest alternative will clearly only work when the latest id is known
- I doubt this is reality.
There was a mention that the actual query is more complex - without seeing
that complexity it's hard to offer further advice. RWB has provided the
correct approach normally taken. If the date is indexed then Oracle can
determine the max date very easily - the query looks worse than reality.
Another approach (which is normally worse though) is to order the query by
date then wrap a "select * from (inner_query} where rownum = 1" around it.
It's clunky though and probably isn't what you are after.
"Daniel W. Fink"
<[EMAIL PROTECTED] To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
.com> cc:
Sent by: Subject: Re: SQL Query Help
[EMAIL PROTECTED]
29/05/2003 12:54
Please respond to
ORACLE-L
SELECT ID,MAX(LastModDate)
FROM Tab
where id = 1
group by ID;
--
Daniel W. Fink
http://www.optimaldba.com
Basavaraja, Ravindra wrote:
>I had tried this as per Oracle Metalink Note.When I add the group by ID it
will display both the records like
>2 1/20/2003 2:56:18 AM
>1 4/23/2003 10:26:42 PM
>
>but I want to see the only the record with the latest time stamp like
>1 4/23/2003 10:26:42 PM
>
>-----Original Message-----
>Sent: Wednesday, May 28, 2003 6:25 PM
>To: Multiple recipients of list ORACLE-L
>
>
>Add "group by ID;" as in:
>
>
>SELECT ID,MAX(LastModDate) FROM Tab
>group by ID;
>
>
>
>>-----Original Message-----
>>From: Basavaraja, Ravindra [mailto:[EMAIL PROTECTED]
>>Sent: Wednesday, May 28, 2003 8:15 PM
>>To: Multiple recipients of list ORACLE-L
>>Subject: SQL Query Help
>>
>>
>>i have a query that returns 2 rows with one column being id
>>and the other
>>being date-time stamp.
>>
>>i want to select the row with the latest timestamp among those two
>>records.they have difference id values
>>
>>SELECT ID,LastModDate
>>FROM Tab
>>
>>ID LastModDate
>>-- -----------
>>2 1/20/2003 2:56:18 AM
>>1 4/23/2003 10:26:42 PM
>>
>>I want to modify the above query to return the row with id=1
>>which has the
>>latest timestamp
>>
>>I tried this
>>
>>SELECT ID,MAX(LastModDate)
>>FROM Tab
>>
>>getting this error
>>OERR: ORA 937 not a single-group group function
>>
>>how do i get this work.
>>
>>Thanks
>>
>>
>>
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--
Author: Daniel W. Fink
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