>Hi everybody,
>
>I'm trying to figure out some strange phenomena.
>
>I have a huge database. I have two similar written queries. One produces 34447 records and another produces 30242.
>
>So, I want to see the difference and first I tried
>
>select * from bigger query
>EXCEPT
>select * from lesser query
>
>and I got 0 results.
>
>I also tried
>
>select * from bigger query where not exists (select 1 from lesser query)
>
>and again I got 0 results.
>
>Can you please explain it to me.
>
>BTW, the lesser query is written quite strangely and the reason I wrote another query is because I can not understand the original one.
>
>Thanks in advance.

What if you use the old way:

SELECT BiggerQuery.*
FROM BiggerQuery
LEFT JOIN LesserQuery ON CommonFields
WHERE LesserQuery.SomeField IS NULL