SQL: remove all duplicate rows

Delete from <table name> a
where a.rowid > ANY (select b.rowid
                                  from <table name> b
                                  //should include all columns required to be unique
                                   where b.<column name 1> = a.<column name 1>
                                             and b.<column name 2> = a.<column name 2>
                                             and b.<column name 3> = a.<column name 3>

                                             . . . . . .

                                    );

OR

Delete from <table name> a
where exists (select *
                    from <table name> b
                    //should include all columns required to be unique
                     where b.<column name 1> = a.<column name 1>
                      and b.<column name 2> = a.<column name 2>
                      and b.<column name 3> = a.<column name 3>

                        . . . . . .

                       and a.rowid > b.rowid);

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