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1) functions are used for computations where as procedures

can be used for performing business logic

2) functions MUST return a value, procedures need not be.

4) function parameters are always IN, no OUT is possible

2. EXEC command can't be used inside a Function where it

can be used inside an sproc.

a. A FUNCTION is always returns a value using the return

statement. A PROCEDURE may return one or more values

through parameters or may not return at all.

b. Functions are normally used for computations where as

procedures are normally used for executing business logic.

c. A Function returns 1 value only. Procedure can return

multiple values (max 1024).

d. Stored procedure returns always integer value by default

zero. Whereas function returns type could be scalar or

table or table values

e. Stored procedure is precompiled execution plan where as

functions are not.

f. A function can call directly by SQL statement like

select func_name from dual while procedure cannot.

g.Stored procedure has the security and reduces the network

traffic and also we can call stored procedure in any no. of

applications at a time.

h. A Function can be used in the SQL Queries while a

procedure cannot be used in SQL queries .that cause a major

difference b/w function and procedures.