you should be able to say:
group_by("first_letter")
should go right in under that label.
works for order by at least.
On Jul 23, 2014, at 7:31 PM, Jonathan Vanasco <[email protected]> wrote:
> I want to generate this SQL:
>
> SELECT
> SUBSTR(domain_name, 1, 1) as first_letter,
> COUNT(domain_name) as counted
> FROM domain
> GROUP BY first_letter;
>
> The closest I can get to it is this:
>
> dbSession.query(
> sqlalchemy.func.count( model.Domain.domain_name
> ).label('counted'),
> sqlalchemy.func.substr( model.Domain.domain_name, 1, 1
> ).label('first_letter'),
> ).group_by(
> sqlalchemy.func.substr( model.Domain.domain_name, 1, 1 )
> )
>
> I tried using this as a the group by:
>
> sqlalchemy.sql.expression.literal('first_letter')
>
> however postgres doesn't like the group by coming in as a bind param.
>
> is there another way to construct the intended query, or do I have to use 2
> substring operations (or a subquery)?
>
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