<Li> pktabname: the name of the table or view that has the primary key to which the foreign key applies . The primary key must already be defined . </Li> <Li> col1: the name of the first column that makes up the foreign key . The foreign key must have at least one column and can have a maximum of eight columns . </Li> <P> Because the database management system enforces referential constraints, it must ensure data integrity if rows in a referenced table are to be deleted (or updated). If dependent rows in referencing tables still exist, those references have to be considered . SQL: 2003 specifies 5 different referential actions that shall take place in such occurrences: </P> <Ul> <Li> CASCADE </Li> <Li> RESTRICT </Li> <Li> NO ACTION </Li> <Li> SET NULL </Li> <Li> SET DEFAULT </Li> </Ul>

What action is taken when the private key