How do I not to repeat the fields in the process of introducing the records, I do not repeat the same user history
$query="INSERT INTO `cashiers` ( `cashiers_CashierID` , `cashiers_CashierOpenDate` , `cashiers_User` , `cashiers_Status` , `cashiers_Delete` ) VALUES ('', '$cashiers_CashierOpenDate', '$ausers_ID', '0','0');";
mysql_query($query);
Well aside from the PDO issue, quick one given you are going to insert the records one by one is something like
If Not Exists(Select something from somewhere where something = ?)
Insert Values (?,... )
Where ? is the key for the table.