On Tue, Apr 11, 2023, at 9:17 PM, Luis Del Rio IV wrote:
> The sql query itself returns several rows, as it should. But when trying to
> combine the max using sqlalchemy the rows return as the following.
>
> Received incompatible instance \"(<server.db.models.Data object at
> 0x7f2c6cfd6670>, '2021-04-10 18', Decimal('7294.00000'))\".",
that's not a SQLAlchemy error. I would again suggest you get help from the
maintainers of the library you're using.
>
> Here I am able to get the max for that row group, but am unable to pass it
> into the DataModel object
>
> On Tuesday, April 11, 2023 at 4:59:15 PM UTC-7 S Mahabl wrote:
>> Do you get many rows?
>>
>> SELECT date_format(data.timestamp, "%Y-%m-%d %H"), max(data.value) AS
>> data_value
>> from data
>> GROUP BY date_format(data.timestamp, "%Y-%m-%d %H")
>> On Tue, Apr 11, 2023 at 4:24 PM Luis Del Rio IV <[email protected]> wrote:
>>> Hello,
>>>
>>> I am currently using the following sqlalchemy code,
>>>
>>> _query = super().get_query(model, info, sort, **args)
>>> query = _query.group_by(
>>> func.date_format(DataModel.timestamp, "%Y-%m-%d %H")
>>> )
>>> return query
>>>
>>> I am trying to aggregate the the max value of a field from DataModel.value
>>> utilizing the group by clause.
>>>
>>> In simple sql, you would do the following.
>>>
>>> SELECT max(data.value) AS data_value
>>> from data
>>> GROUP BY date_format(data.timestamp, "%Y-%m-%d %H")
>>>
>>> What would the proper way to express this? The various methods I have tried
>>> somehow overwrite the original query and do not map to our attributes.
>>>
>>>
>>> --
>>> SQLAlchemy -
>>> The Python SQL Toolkit and Object Relational Mapper
>>>
>>> http://www.sqlalchemy.org/
>>>
>>> To post example code, please provide an MCVE: Minimal, Complete, and
>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
>>> description.
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>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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