As an example, if a query returns a value of one from an integer column, you would get a string of with a default cursor, whereas with a binary cursor you would get a 4-byte field containing the internal representation of the value (in big-endian byte order). Many applications, including command, the Bind protocol message specifies whether data is to be retrieved in text or binary format.
This choice overrides the way that the cursor is defined.
A cursor can hold more than one row, but can process only one row at a time.
If there is any type mismatch, variable assignments and comparisons may not work the way you expect.
To be safe, instead of hard coding the type of a variable, you should use the This program has no effect when run, because there are no changes to the database.
Information is transmitted between a PL/SQL program and the database through variables. In many cases, a PL/SQL variable will be used to manipulate data stored in a existing relation.
Every variable has a specific type associated with it. In this case, it is essential that the variable have the same type as the relation column.