posted 15 years ago
Theta join is the join when two entities are joined not on the relationship exist between them but explicitly specifying some other field.
Select b
from b.item,c.categories
where b.(something other than relationship)=c.(something)
Inner join is the join on relationship entities and no need to sepecify the join in =,only the matching entities are there that exist in both the entities
select b
from b.item INNER JOIN c.categoreis
Outer join when you want all the field of one side to exist whether match is found or not LEFT ,RIGHT,
Correct me if i am wrong