Tài liệu PL/SQL User’s Guide and Reference phần 8

Keyword and Parameter Description
cursor_name
This identifies an explicit cursor previously declared within the current scope.
datatype
This is a type specifier. For the syntax of datatype, see Constants and Variables
on page 11-33.
db_table_name
This identifies a database table (or view) that must be accessible when the
declaration is elaborated.
expression
This is an arbitrarily complex combination of variables, constants, literals,
operators, and function calls. The simplest expression consists of a single variable.
When the declaration is elaborated, the value of expression is assigned to the
parameter. The value and the parameter must have compatible datatypes.
parameter_name
This identifies a cursor parameter; that is, a variable declared as the formal
parameter of a cursor. A cursor parameter can appear in a query wherever a
constant can appear. The formal parameters of a cursor must be IN parameters. The
query can also reference other PL/SQL variables within its scope.