Even more test data generated using the testdata_ninja plsql package

Last entry to the testdata_ninja blog roll, was about how to create iterators that were unique
when you create test data rows. In this entry I will show how to use back references to other column values
to use them as input to other row generator functions. One example could be that you were creating a table
of employees and you wanted the name to be more realistic. So we could have a country column in the row as well
and use that as an input to create the name, so it looks like a name from that country.