I have a query selecting the greatest value of 2 timestamps.
To achieve it I'm calling:
SELECT GREATEST( IFNULL( tableb.create_time, 0 ) , IFNULL( tablea.create_time, 0 ) )
I'm using IFNULL
because the create_time
value can be null
.
The problem is that the result is something like '2014-0' instead of '2014-08-14 17:04:39'
Here's a fiddle to illustrate my problem
The result is OK when:
- I'm not using
IFNULL
- I'm using IFNULL but I have no join in the query (so the
GREATEST
is performed on 2 timestamps in the same table)
So for me the problem comes really from the use of GREATEST
and IFNULL
in a join query.
Best Answer
It just so happens that
FROM_UNIXTIME(18000)
is'1970-01-01 00:00:00'