diffrance between stored procedure & function in sql server?
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Answer Posted / dev
Difference between function and stored proc:
========================================================
Stored Procedure :supports deffered name resoultion Example
while writing a stored procedure
that uses table named tabl1 and tabl2 etc..but actually not
exists in database is allowed
only in during creation but runtime throws errorFunction
wont support deffered name
resolution.
2. Stored procedure returns always integer value by default
zero. where as function return
type could be scalar or table or table values(SQL Server).
3. Stored Procedure is pre compiled exuction plan where as
functions are not.
4. Stored Procedure retuns more than one value at a time
while funtion returns only one
value at a time.
5. We can call the functions in sql statements (select max
(sal) from emp). where as sp is
not so
6. Function do not return the images,text whereas sp
returns all.
7. Function and sp both can return the values. But function
returns 1 value only.
procedure can return multiple values(max. 1024) we can
select the fields from function. in
the case of procdure we cannot select the fields.
8. Functions are used for computations where as procedures
can be used for performing
business logic
9. Functions MUST return a value, procedures need not be.
10. You can have DML(insert, update, delete) statements in
a function. But, you cannot call
such a function in a SQL query..eg: suppose, if u have a
function that is updating a table..
you can't call that function in any sql query.
- select myFunction(field) from sometable;
will throw error.
11. Function parameters are always IN, no OUT is possible
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