ROWID columns

You can use ROWID columns to create a unique index for tables that have no obvious unique index column or columns.

After a row has been inserted, you cannot update the data in a ROWID column. You can only specify a ROWID value on insert operations for ROWID columns defined as GENERATED BY DEFAULT. See the DB2 for z/OS SQL Reference.

When FM/Db2 generates the template for a table containing a ROWID column, the ROWID column is deselected and is not initially displayed in a File Manager/Db2 editor session.