Thank you Leonel,

I actually have a very complex query, and it ran into the error I 
mentioned. In my query I have:
db(query).select(other_fields, aggregate, groupby=...etc..., orderby=...etc
...)

and I ran into the error. So I tried to identify if it was my complex query 
throwing the error, my model or some other part, and over 4 hours (too 
long, I know...) I narrowed down to the aggregate, I tested specifically to 
the example provided by the web2py book. It still gave the same error.

In my normal use-case, I have a "query", but it's still good to know and 
add to the book that it is deprecated.


On Friday, July 14, 2017 at 8:17:11 AM UTC+8, Leonel Câmara wrote:
>
> Note this is deprecated:
>
> row = db().select(max)
>
> Calling db() like that without a query will break common filters for 
> instance.
>

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