Grouping MySQL results by 7 day increments -


hoping might able assist me this.

assume have table listed below. hosts can show multiple times on same date, different backupsizes.

+------------------+--------------+ | field            | type         |  +------------------+--------------+ | startdate        | date         | | host             | varchar(255) |  | backupsize       | float(6,2)   |   +------------------+--------------+

how find sum total of backupsize 7 day increments starting earliest date, through last date? don't mind if last few days cut off because don't fall 7 day increment.

desired output (prefered): 

+------------+----------+----------+----------+----- |week of     | system01 | system02 | system03 | ... +------------+----------+----------+----------+----- | 2014/07/30 | 2343.23  | 232.34   | 989.34   | +------------+----------+----------+----------+----- | 2014/08/06 | 2334.7   | 874.13   | 234.90   | +------------+----------+----------+----------+----- | ...        | ...      | ...      | ...      |

or

+------------+------------+------------+------ |host        | 2014/07/30 | 2014/08/06 | ... +------------+------------+------------+------ | system01   | 2343.23    | 2334.7     | ...   +------------+------------+------------+------- | system02   | 232.34     | 874.13     | ... +------------+------------+------------+------- | system03   | 989.34     | 234.90     | ... +------------+------------+------------+------- | ...        | ...        | ...        |

date format not concern, long gets identified somehow. also, order of hosts not concern either. thanks!

the simplest way earliest date , count number of days:

select x.minsd + interval floor(datediff(x.minsd, lb.startdate) / 7) day `week of`,        host,        sum(backupsize) listedbelow lb cross join      (select min(startdate) minsd listedbelow lb) x group floor(datediff(x.minsd, lb.startdate) / 7) order 1;

this produces form week of , host on each row. can pivot results see fit.


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