If else in stored procedure sql server

Question

I have created a stored procedure as follow:

Create Procedure sp_ADD_USER_EXTRANET_CLIENT_INDEX_PHY
(
@ParLngId int output
)
as
Begin
    SET @ParLngId = (Select         


        

Answer 1

If there are no matching row/s then @ParLngId will be NULL not zero, so you need IF @ParLngId IS NULL.

You should also use SCOPE_IDENTITY() rather than @@IDENTITY.