sql server - Sql Inner join query on condition when specific value -


i have following query:

select art.id, art.nummer, art.serie, art.eanbarcode, art.preis, art.volumen, art.vater, art.name, art.amazon, kat.name, subkat.name, subsubkat.name tbartikel art  inner join tbkategorie kat on art.fk_kategorie_id=kat.id inner join tbsubkategorie subkat on art.fk_subkategorie_id=subkat.id inner join tbsubsubkategorie subsubkat on art.fk_subsubkategorie_id=subsubkat.id right(art.nummer,2)='.1' 

the situation art.fk_subsubkategorie_id can null (developers did setting 0 instead of null) - knows bad habit how is. want make if there 0 art.fk_subsubkategorie_id want take record , subsubkat.name put empty string. hope got point.

additional question if possible(ps): there diffrence in condition if do:

where right(art.nummer,2)='.1' art.nummer '%.1' 

or even:

where not right(art.nummer,2)='.1' art.nummer not '%.1' 

i know working indexes, talking whether in case both work , search same? using specific articles.

try this;

select art.id, art.nummer, art.serie,  art.eanbarcode, art.preis, art.volumen, art.vater, art.name,  art.amazon, kat.name, subkat.name, isnull(subsubkat.name,'') tbartikel art  inner join tbkategorie kat on art.fk_kategorie_id=kat.id inner join tbsubkategorie subkat on art.fk_subkategorie_id=subkat.id left outer join tbsubsubkategorie subsubkat on art.fk_subsubkategorie_id=subsubkat.id right(art.nummer,2)='.1' 

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