Answer Posted / anurag arun edlabadkar

Question: Difference Between Procedure &
Function?
1). Both functions and procedures can return values.

2). Both can return multiple values, like in the case of
procedure it can return multiple values using OUT and INOUT
type parameter, while in case of function used in Report 6i,
using "PLACEHOLDER COLUMN" you can return multiple values.

3). "Complete Reference" Book say that function can use
parameters as IN, OUT, and INOUT as same as in Procedure.

/*

create function syntax

The syntax for the create function command is more
complicated than the syntax for the create procedure
command. At a high level, the syntax is

create [or replace] function [schema.] function
[(argument [in | out | inout ] [nocopy] datatype
[, argument [in | out | inout ] [nocopy]
datatype]...
)]
return datatype

*/

4). Function returns value using "Return" Key Word, where
same key word can be used in Procedure to Terminate the
program, with immidiate effect.

5). Functions are used for computations where as procedures
can be used for performing business logic.

6). Functions MUST Return a value, procedures need not be.

7). You can have DML(insert,update, delete) statements in a
function.

8). You can call a function in a Select Query where as
not Procedure.

9). Function returns 1 value only where as Procedure can
return
multiple values(max. 1024)

10). A procedure may modifiy an object where a function can
only return a value.

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