On Wed, Sep 5, 2012 at 3:12 PM, Marin Pranjić <marin.pran...@gmail.com>wrote:

> it is db.table.field != None
>
> operator ~ is used for ORDER BY and it maps to DESC.


Yes, my bad, you are right, but there is one case where ~ is used in query

~db.table.field.belongs(list) and ~db.table.listfield.contains(value)

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