I have a set or records and I want to count and group them by a certain range e.g. I want to count the records that were created by groups of X days
e.g. SELECT COUNT(*) FROM `table` GROUP BY /*`created` 3 days/*
Here is an example with dates.
create table t1(created date not null);
insert
into t1(created) values (date '2011-01-09')
,(date '2011-01-10')
,(date '2011-01-11')
,(date '2011-01-12')
,(date '2011-01-13')
,(date '2011-01-14')
,(date '2011-01-15')
,(date '2011-01-16')
,(date '2011-01-17')
,(date '2011-01-18')
,(date '2011-01-19')
,(date '2011-01-20');
select floor(datediff(now(), created) / 3) * 3 as days_ago
,min(created)
,max(created)
,count(*)
from t1
group
by floor(datediff(now(), created) / 3);
+----------+--------------+--------------+----------+
| days_ago | min(created) | max(created) | count(*) |
+----------+--------------+--------------+----------+
| 0 | 2011-01-18 | 2011-01-20 | 3 |
| 3 | 2011-01-15 | 2011-01-17 | 3 |
| 6 | 2011-01-12 | 2011-01-14 | 3 |
| 9 | 2011-01-09 | 2011-01-11 | 3 |
+----------+--------------+--------------+----------+
4 rows in set (0.00 sec)
You can do something likeSELECT COUNT(*) FROM table GROUP BY FLOOR(created / 3)
... I think.
Although if created
is a date field, you'll have to do a little more jiggering to get it into a number value for this to work.
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