Oracle - deleting duplicates

Question

I have found the following way for removing duplicates:

DELETE FROM
   table_name A
WHERE
  a.rowid >
   ANY (
     SELECT
        B.rowid
     FROM
        t         


        

Answer 1

Like this:

DELETE FROM         // The command to delete
   table_name A     //the table in which you want to remove duplicate
WHERE               //condition
  a.rowid >         //checking the rowid which oracle adds to each row. Oracle Database rowid values contain information necessary to locate a row.
   ANY (             //any row which has a condition
     SELECT          //select
        B.rowid      //rowid
     FROM             //from  
        table_name B    //table name with alias name as B. Is used for making a self join
     WHERE               //condition
        A.col1 = B.col1    //where the column1 has the same rowid 
     AND                    //and
        A.col2 = B.col2     //where the column2 has the same rowid 
        );