db( (db.MatchPlayers.player==playerID) & (db.MatchPlayers.match_ == 
db.Matches.id) & (db.Matches.started == None) ).delete()

gives:

raise RuntimeError("Too many tables selected")

any hints?

http://web2py.com/books/default/chapter/29/06#count,-isempty,-delete,-update
 
I don't find examples for similar cases

I could select first , and then loop deleting records of needed table ... 
but would be not very efficiet

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