When you use SELECT in a PL/SQL block, it’s important to make sure that exactly one row will always be returned by your query. If more than one row is returned, the TOO_MANY_ROWS exception occurs.

I have a distributed app that is returning me some inserts & updates on a table, but the insert has an extra (unneeded) column.So when I receive the insert of course I get an "Inavlid column name ...