SQL begin end print

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

Answer 2

Most probably a case of meaning AND and not OR . Then it should have the result you expect.

Answer 3

The @ID is not Null so it meets the requirement for half of your OR statement. If you want it to not hit the print, then you should use AND .

Answer 4

您的第一个条件@ID iS NOT NULL为true，因此它将进入内部并打印该语句。

Answer 5

IF (@ID IS NOT NULL OR @ID <> 0)

由于@ID不为null，因此进入begin-end块。