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Look - the query has to search the ENTIRE output of the IN (SELECT ..)
for each set of rows it deletes. I know that rowid's are what you get from an index.

Instead of me going on about this -...

rowid is not an indexed column - it is a "pseudocolumn'. the in () subselect will read thru the entire select statement's result set each time. When I get back in a while I'll write something that...