I have a set of rows with a MySQL datetime field, and I want to calculate the average date on a subset of them. SQL WHERE clauses are easy, but how does one go from a datetime column to an average date?
The field is called Created, and when I try a naive approach, I get some pretty odd results:
SELECT AVG(Date(Created)) FROM table WHERE BLAH:
+---------------------------+
| AVG(Date(Created)) |
+---------------------------+
| 20140599.8857143 |
+---------------------------+
I'd prefer output that that returned something like 2014-05-31, but DATE() on the results of AVG() just give me NULL. How do I get an intelligible query result out of SQL?
Try:
SELECT FROM_UNIXTIME(AVG(UNIX_TIMESTAMP(created))) FROM table
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