Note, you can do:

minus_5_min = 'DATETIME((writetime), "-5 minutes")'
row = db(db.mytable).select(minus_5_min).first()
print row[minus_5_min]

Anthony

On Thursday, May 29, 2014 11:49:06 PM UTC-4, Pham Quang Dung wrote:
>
> Hm,
> Not true, I forgot to say I did with execlsql OK, for Sqlite, 
> select DATETIME((writetime), "-5 minutes") from xxx
>
> On Friday, May 30, 2014 2:35:42 AM UTC+7, Niphlod wrote:
>>
>> This will never work because there is no notion of "timedelta" in any db 
>> backend (nor any substitute for it).
>> Calculate the result AFTER fetching the rows from the db. 
>>
>> On Thursday, May 29, 2014 12:32:41 PM UTC+2, Pham Quang Dung wrote:
>>>
>>> I tried a query like *db().select(xx.writetime - timedelta(minutes=5)) *and 
>>> the result was totally a surprise because it was of type "Int". Thoughts?
>>>
>>

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