what is difference between pass by value and eference by value in oracle plsql

what is difference between pass by value and eference by
value in oracle plsql

Question Posted / karthik

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what is difference between pass by value and eference by value in oracle plsql..

Answer / welcomeashwin

PASS-BY-VALUE(FUNCTION)
1)All parameters must be write-only using the IN mode
2)Parameters are locally scoped that cannot be changed
3)Any parameters can use any valid SQL or PL/SQL datatype.
Only functions with parameter lists that use SQL datatypes
work with SQL statements.
4)Any IN parameter can have a default value
5)The formal return values can use any SQL or PL/SQL
datatype, but pipelined return tables must use SQL.
6)Any system cursor is not writeable and must be passed as a
IN parameter

PASS-BY-REFERENCE (FUNCTION)
1)You must have one parameter as read-only or read-write
2)All formal parameters are locally scoped variables that
you can change during operation inside the function
3)Any parameters can use any valid SQL or PL/SQL datatype.
Only functions with parameter lists that use SQL datatypes
work with SQL statements.
4)Any IN parameter can have a default value
5)The formal return values can use any SQL or PL/SQL
datatype, but pipelined return tables must use SQL.
6)Any system cursor is not writeable and must be passed as a
IN parameter

PASS-BY-VALUE (PROCEDURE)
1)All parameters must be write-only using the IN mode
2)Parameters are locally scoped that cannot be changed
3)Any parameters can use any valid SQL or PL/SQL datatype.
4)Any IN parameter can have a default value
5)Any system cursor is not writeable and must be passed as a
IN parameter

PASS-BY-REFERENCE (PROCEDURE)
1)At least one parameter must be defined as read-only or
read-write.
2)Parameters are locally scoped that can be changed
3)Any parameters can use any valid SQL or PL/SQL datatype.
4)Any IN parameter can have a default value
5)Any system cursor is not writeable and must be passed as a
IN parameter

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