Both of the approaches you suggested are not yielding any results.

> given that db.entries.date is a datetime field, the former is fetched with
>
> db(db.entries.id > 0).select(db.entries.date.year(), distinct=True)
>
> while the latter, e.g. the entry count per year, with
>
> sum_of_entries = db.entries.id.count()
> db(db.entries.id > 0).select(sum_of_entries, db.entries.date.year(), 
> groupby=db.entries.date.year())
>
>
I tried assigning the results of the query to a variable and display it in 
a view, which does not work.

In Controller:
def year():
    years = db(db.mydiary.id > 0).select(db.mydiary.Date.year(), distinct=
True)

    return locals() 


In View:
<div class="well">
{{=BEAUTIFY(years)}}
{{=years}} 
</div>

the variable is printed twice purposely.

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