How to Delete duplicate records using X++

static void DeleteDuplicateValues(Args _args)
{
    Set fieldset = new set(types::Integer);

    // create dictindex from unique index

    DictIndex dictIndex = new dictIndex (tablenum(PurchTable), indexnum(PurchTable,PurchIdx));
    ;

    // these are fields from index

    // add them to set

    fieldset.add(fieldnum(PurchTable ,OrderAccount));
 
    //Can add multiple fields also
    //fieldset.add();  
    //Note the index should Not be primary index it alternake key should be no
    ReleaseUpdateDB::indexAllowDup(dictIndex);  

    // set allow duplicates

    ReleaseUpdateDB::deleteDuplicatesUsingIds(tablenum(PurchTable),0,fieldset);

    //reenable duplicates

    ReleaseUpdateDB::indexAllowNoDup(dictIndex);
 
    //Can also handle timestatekey index
    //by ReleaseUpdateDB::indexAllowNoDupAndDateEffective(dictIndex,ValidTimeStateMode::NoGap);  
 
    info("Deletion done");
}