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