Problem with JOIN statement [Firebird]

Having problems with a join statement. The code itself is working, but it's not showing up all the records I want.

Lag = Teams in the database
Spelare = Players in the database

The "join Spelare S on L.Klubb" is joining the teams in the two tables.
My problem however, is that not all team's are added into Lag L which makes them not show up.

The only results shown are where the players have a team that's also added into the table Lag. If the team is not added there it doesn't show up (probably because of the joined statement and the "where NOT L.Division = 'NHL') ?

I want all records but NOT L.Division = 'NHL' to show up, even the ones that doesn't have a team in the Lag table.

Should I use NULL somehow to identify the "unknown" teams or something?
select S.* from Lag L join Spelare S on L.Klubb = S.Klubb where NOT L.Division = 'NHL'  and S.Rattigheter is null and S.Alder > 17 and S.Alder < 30 order by (S.Off+S.Def) * (S.Potential*4) / (S.Alder*3) DESC

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MerlaP83Asked:
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Nick UpsonPrincipal Operations EngineerCommented:
 

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you need right join, 

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select S.* from Lag L right join Spelare S on L.Klubb = S.Klubb where NOT L.Division = 'NHL'  and S.Rattigheter is null and S.Alder > 17 and S.Alder < 30 order by (S.Off+S.Def) * (S.Potential*4) / (S.Alder*3) DESC

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MerlaP83Author Commented:
Unfortunately that didn't work.

The problem seems to be with where NOT L.Division = 'NHL'. If I remove that line, then everything is showing up. But I need to use that line as well to filter out some players - and if the player's team is not added to Lag, then it seems to skip that player, which is wrong.
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Nick UpsonPrincipal Operations EngineerCommented:
where ( L.Division <> 'NHL' or L.division is null)
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