SUMs and Grouping By Date - mysql

Question

I have a table that looks like this:
ID t_stamp views uviews hits uhits
1 7/18/2012 19:00 105 11 0 0
5 7/18/2012 20:00 1 1 0 0
2 7/19/2012 9:00 118 4 0 0
1 7/19/2012 10:00 196 18 0 0
7 7/19/2012 11:00 2 1 0 0
2 7/19/2012 12:00 38 11 0 0
2 7/19/2012 13:00 20 5 0 0
2 7/19/2012 19:00 9 2 0 0
2 7/20/2012 15:00 85 6 0 0
1 7/20/2012 16:00 483 101 2 2
2 7/20/2012 17:00 1200 240 0 0
2 7/20/2012 18:00 1200 232 0 0
2 7/20/2012 19:00 1199 231 0 0
2 7/20/2012 20:00 1200 236 0 0
2 7/20/2012 21:00 1201 237 0 0
1 7/20/2012 22:00 1220 187 0 0
1 7/20/2012 23:00 869 165 0 0
And my method is to combine them by the day so I can get a SUM for each of the last four columns. The IDs do not really matter.
I am using this:
SELECT `bannerID` , DATE_FORMAT( `t_stamp` , '%m/%d/%Y' ) AS `date` ,
SUM( `views` ) AS `views` , SUM( `uviews` ) AS `uviews` , SUM( `hits` ) AS `hits` , SUM( `uhits` ) AS `uhits`
FROM test_bannerstats
WHERE DATE( t_stamp ) >= DATE( '2012-07-01' )
AND DATE( t_stamp ) <= DATE( '2012-08-24' )
GROUP BY `date`
ORDER BY `date` ASC
However that doesn't seem correct to me as that the numbers seem conflicting. In the end I want to get a daily tally the last four columns by day.
EDIT:
It is a problem with time zones it looks! I will show you why...
Look at the table above, now let's do the additions for the entire day...
1 07/18/2012 106 12 0 0
1 07/19/2012 383 41 0 0
1 07/20/2012 8657 1635 2 2
Above is correct. Below is wrong.
1 07/18/2012 105 11 0 0
1 07/19/2012 384 42 0 0
1 07/20/2012 4167 810 2 2
The problem? Anything after 8pm is going to the next day. It is a timezone issue that I have to sort out it seems.

Answer 1

Your query can be simplified as:
SELECT `bannerID`,
DATE_FORMAT( `t_stamp` , '%m/%d/%Y' ) AS `date`,
SUM( `views` ) AS `views`,
SUM( `uviews` ) AS `uviews`,
SUM( `hits` ) AS `hits`,
SUM( `uhits` ) AS `uhits`
FROM test_bannerstats
WHERE DATE( t_stamp ) BETWEEN '2012-07-01' AND '2012-08-24'
GROUP BY DATE(t_stamp)
ORDER BY DATE(t_stamp) ASC;

Answer 2

try this one,
SELECT DATE_FORMAT(DATE(t_stamp), '%m/%d/%Y') AS `date`,
SUM(views) totalViews,
SUM(uviews) totalUViews,
SUM(hits) totalHits,
SUM(uhits) totalUHits,
FROM tableName
WHERE DATE( t_stamp ) >= DATE( '2012-07-01' ) AND
DATE( t_stamp ) <= DATE( '2012-08-24' )
GROUP BY DATE(t_stamp)
ORDER BY `date` ASC

Answer 3

I think you're sql query wont really work, that is only applicable for date july 1 to august 24. What if the last 4 date is beyond that date? It wont pick up anything.
In my opinion the best way to do it is this:
SELECT SUM(column_name) FROM table_name order by id DESC limit 4;
Order by ID desc will sort the results in descending order. Limit 4, will only pick up the first 4 results.
Hope that helps.

Answer 4

If you want to give your indexes a chance to be used, avoid using functions on columns when you can. Replace the conditions:
WHERE DATE( t_stamp ) >= DATE( '2012-07-01' )
AND DATE( t_stamp ) <= DATE( '2012-08-24' )`
with:
WHERE t_stamp >= DATE( '2012-07-01' )
AND t_stamp < DATE( '2012-08-25' )
You define the alias date in the SELECT list. This alias cannot be used in the WHERE or GROUP BY clauses (to be honest, it can be used at the GROUP BY clause but I wouldn't recommend it). Instead of:
GROUP BY `date`
use:
GROUP BY DATE(t_stamp)
There is a proprietary MySQL syntax available (you can read it at the SELECT documenation) when the GROUP BY and ORDER BY are done on the same expression. Instead of:
GROUP BY DATE(t_stamp)
ORDER BY DATE(t_stamp) ASC;
you can use (for a slight efficiency gain):
GROUP BY DATE( t_stamp ) ASC ;
The query becomes now:
SELECT
bannerID
, DATE_FORMAT( DATE( t_stamp ), '%m/%d/%Y' ) AS `date`
, SUM( views ) AS views
, SUM( uviews ) AS uviews
, SUM( hits ) AS hits
, SUM( uhits ) AS uhits
FROM
test_bannerstats
WHERE
t_stamp >= DATE( '2012-07-01' )
AND
t_stamp < DATE( '2012-08-25' ) --- notice the `<` and the +1 date offset
GROUP BY
DATE( t_stamp ) ASC ;