Friday, May 10, 2013

isnull function in sql server

Replaces NULL with the specified replacement value.

Syntax :

ISNULL ( check_expression , replacement_value )

Example  :
                    If any Parameter has null value ,you can replace with specified value.
-------------------CREATE Table --------------
create table testtable
  amount int null

---------------------Now inset null value in table------------------
insert into testtable
select null
--------------This table now return null value--------------------
select amount from testtable
---  NULL

--------------Now using ISNULL function-replace Null value to 0---------------

select isnull(amount,0)

-------------------After Using ISNULL function output is  0

drop table testtable

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