Multi-Month - Group by Month Query

I need a query that produces a Multi-Month By Month Grouping...

For Example:

Table has entries with unique prices, and timestamps....  I need a Total Per Month, and Grouped by Month result.

Array might look like: (pseudo)

Orders{
  [JOHN]
    [TOTAL] [30000] [MONTH_TIMESTAMP or MONTH NAME]

}

Please ask more info as I likely need to provide you more information.



ORDER (table name)
  ID, SALES_PERSON_ID, TS_ENTERED, GROSS_PROFIT (fields)

USERS (table name)
 USERID

I need a Query where I retrieve total of all orders within a given span of months, and the same PER A SPECIFIC SALES PERSON (see above shortened table structure)


SMabsAsked:
Who is Participating?
 
Kevin CrossConnect With a Mentor Chief Technology OfficerCommented:
On your question regarding using DATETIME verus TIMESTAMP, I would see this nice manual reference:
http://dev.mysql.com/doc/refman/5.1/en/datetime.html

The biggest thing to note is the range of supported date/time combinations.  Unix Timestamp is the number of seconds since the last EPOCH which is '1970-01-01', so you will see its range starts with '1970-01-01 00:00:01' and is limited to storage size of an integer (4 bytes) or 2^31 ; therefore, you will see that you can only store 2147483646 seconds or in other words up to '2038-01-19 03:14:07'.

Aside from this, you will have to use FROM_UNIXTIME if you want to display your date in a human readable format, which may be inconvenient.

Anyway for the select, you can do something similar to this once you have worked out details on the column -- I will show below with the date column as a datetime.

select u.USERNAME
   --, year(o.TS_ENTERED) as Yr
   --, month(o.TS_ENTERED) as Mo
     , monthname(o.TS_ENTERED) as Mo
     , sum(o.GROSS_PROFIT) as Totals
from ORDERS o
join USERS u on u.USERID = o.SALES_PERSON_ID
group by u.USERNAME
     --, year(o.TS_ENTERED)
     --, month(o.TS_ENTERED)
       , monthname(o.TS_ENTERED)
;

The commented out portions are other examples.  The Year may be required addition to ensure you separate 2009 data from 2010 for example, but if you are using a where clause to filter the data this may not be of consequence to you.  Additionally, you will find it hard to sort by month using the name, so may be interested in the month number instead.

Date function reference:
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html

Hope that all helps!

Regards,
Kevin
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SMabsAuthor Commented:
Also, would it be EASIER to base dates on SQL Timestamp versus the UNIX Timestamp which I currently use for all timestamps in my databases...

Pros & Cons of the two different forms of time are appreciated.
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SMabsAuthor Commented:
I will get back to this shortly....
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SMabsAuthor Commented:
thanks
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