I assume that you want to select all users without a list? You will
need to construct a set that contains all users and possible joined
list field. This set can than be filtered using the fields in the list
table. This is a typical leftjoin case wich can be peformed as folows:

User.select(List.q.userID==None, join=LEFTJOINOn(User, List,
User.q.id==List.q.userID))

This will create something like:

SELECT * FROM  user
LEFT JOIN list ON user.id=list.user_id
WHERE list.user_id IS NOT NULL


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