Question

I have following tsql code in sql server 2008:

    declare @ID INT  
    SET @ID = 0
    IF (@ID IS NOT NULL OR @ID <> 0) 
    begin
      print 'ID is not 0 or null'
    end

Since @ID is 0, why does it even get into the begin end … It should not.

Answer 1

You have better luck using and instead

declare @ID INT  
    SET @ID = 0
    IF (@ID IS NOT NULL AND @ID <> 0) 
    begin
      print 'ID is not 0 or null'
    end