IS NULL doesn't work as expected in MSSQL 2000 with no Service Pack on it

Posted by user306825 on Stack Overflow See other posts from Stack Overflow or by user306825
Published on 2010-04-01T11:51:11Z Indexed on 2010/04/01 11:53 UTC
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is

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null

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outer

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join

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t-sql

The following batch executed on different instances of mssql 2000 illustrates the problem.

select @@version

create table a (a int) create table b (b int)

insert into a(a) values (1) insert into a(a) values (2) insert into a(a) values (3) insert into b(b) values (1) insert into b(b) values (2)

select * from a left outer join (select 1 as test, b from b) as j on j.b = a.a where j.test IS NULL

drop table a drop table b

(1 row(s) affected)

(1 row(s) affected) a test b

(0 row(s) affected)

Output 2:

(1 row(s) affected)

(1 row(s) affected) a test b

3 NULL NULL

(1 row(s) affected)

If someone encounters the same problem - make sure you have the SP installed!

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