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added equi-join

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git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@11 014f5005-505e-4b48-8d0a-63407b615a7c
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LtWorf 2008-07-17 22:44:26 +00:00
parent 7042bef744
commit d91bafafda
1 changed files with 4 additions and 0 deletions
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4
relation.py
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@ -213,6 +213,10 @@ class relation (object):
if e not in newt.content: if e not in newt.content:
newt.content.append(list(e)) newt.content.append(list(e))
return newt return newt
def equijoin(self,other,expr):
'''Defined as product and then selection with the given expression.'''
return self.product(other).selection(expr)
def outer(self,other): def outer(self,other):
'''Does a left and a right outer join and returns their union.''' '''Does a left and a right outer join and returns their union.'''
a=self.outer_right(other) a=self.outer_right(other)