On Nov 4, 2011, at 4:54 AM, Stefano Fontanelli wrote:
> Il 04/11/11 03.08, Mark Erbaugh ha scritto:
>>
>> On Nov 3, 2011, at 2:54 PM, Stefano Fontanelli wrote:
>>
>>> Il 03/11/11 19.18, Mark Erbaugh ha scritto:
>>>> Using the query object count() method generates a sub-query (as per the
>>>> docs). The docs say to use func.count to avoid the subquery. func.count
>>>> seems to require a field object. Is there a way to generate a query that
>>>> essentially becomes 'select count(*) from table' using the ORM, not the
>>>> SQL generator?
>>>>
>>>> Thanks,
>>>> Mark
>>>>
>>> Did you try func.count('*')?
>> How would you specify the table you want counted? I trued
>> func.count('table.*') and that didn't work.
>
> Check the manual: http://www.sqlalchemy.org/docs/orm/tutorial.html#counting
>
> To achieve our simple SELECT count(*) FROM table, we can apply it as:
>
> SQL>>> session.query(func.count('*')).select_from(User).scal
> ar()
>
> Is that right for you?
Stefano,
Thanks. I missed that in the documentation and it does indeed generate the
expected SQL (at least with SQLite).
Mark
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