Question

Possible Duplicate:
SQL Count records within a month using a unix timestamp

I have a table like this

+--------+------------+         
|    id  | datetime   |  
+--------+------------+   
|      1 | 1313405609 |  
|      1 | 1313144410 |  
|      2 | 1313405550 |  
|      1 | 1313405549 |  
+--------+------------+

datetime is php unix time, I want to group row by date(e.g. 20120517) and count every group items. Because the date of 1313405609,1313405550 and 1313405549 is 20110815, the result I want is:

+--------+------------+------------+  
|     id | datetime   |    Count   |  
+--------+------------+------------+  
|      1 | 1313405609 |      2     |  
|      1 | 1313144410 |      1     |   
|      2 | 1313405550 |      1     |  
+--------+------------+------------+

how can I do it with sql?

Answer 1

Use FROM_UNIXTIME to convert a unix timestamp to a datetime. Then use DATE to get only the date part:

select
  id,
  min(datetime) as datetime,
  count(*) as Count
from
  YourTable t
group by
  id,
  date(from_unixtime(datetime))