From d91bafafda99194ee4f58cec759ccff194874c17 Mon Sep 17 00:00:00 2001
From: LtWorf <LtWorf@014f5005-505e-4b48-8d0a-63407b615a7c>
Date: Thu, 17 Jul 2008 22:44:26 +0000
Subject: [PATCH] added equi-join

git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@11 014f5005-505e-4b48-8d0a-63407b615a7c
---
 relation.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/relation.py b/relation.py
index 62e005f..6e70f72 100644
--- a/relation.py
+++ b/relation.py
@@ -213,6 +213,10 @@ class relation (object):
 			if e not in newt.content:
 				newt.content.append(list(e))
 		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):
 		'''Does a left and a right outer join and returns their union.'''
 		a=self.outer_right(other)