Fiquei na dúvida nessa questão. Como ficaria então os "implicit cursors" ?
"Implicit cursors are automatically created by Oracle whenever an SQL
statement is executed, when there is no explicit cursor for the
statement. Programmers cannot control the implicit cursors and the
information in it.
Whenever a DML statement (INSERT, UPDATE and DELETE) is issued, an implicit cursor is associated with this statement."
Fonte: https://docs.oracle.com/cd/B12037_01/appdev.101/b10807/13_elems048.htm
http://www.tutorialspoint.com/plsql/plsql_cursors.htm