I'm having trouble with max() and group by.
It seems pretty simple. I hope someone can point out my mistake.
I want to select the max index of a group.
In other words, I want to find the last record added for each group.
The problem I'm having is that the columns of the resulting rows
are mixed
, April 21, 2004 10:35 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Confused by max and group by
I'm having trouble with max() and group by.
It seems pretty simple. I hope someone can point out my mistake.
I want to select the max index of a group.
In other words, I want
I think what is happening is that you are getting the max value for one
field, but the first values for the other fields. Try ordering you
group by:
SELECT max(myindex), myval, mycat
FROM `mytest`
GROUP BY mycat DESC;
On Apr 21, 2004, at 1:35 PM, Noah Spurrier wrote:
I'm having trouble with
The problem you are running into is that you are getting the max of one
field and grouping by another. But then you want to get a third field
that changes within the grouping.
Perhaps this might work
SELECT myindex, myval, mycat
FROM `mytest`
GROUP BY mycat
ORDER BY myindex DESC;
PROTECTED]
Sent: Wednesday, April 21, 2004 1:46 PM
To: Chris
Cc: [EMAIL PROTECTED]
Subject: Re: Confused by max and group by
This seems bizarre. Although I am the SQL neophyte and it is perhaps not
my right to whine about the mysteries of SQL, but this seem very surprising
and nonintuitive
