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      delete from tbl_talbe
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     (select col1,col2,col3
       from tbl_table
       group by col1,col2,col3
       having count(*)>1)
     and rowid not in
     (
        select max(rowid)
        from tbl_table
        group by col1,col2,col3
        having count(*) >1
     )
    


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