1 files changed, 13 insertions, 0 deletions
diff --git a/lib/sql_algebra/relations/relation.rb b/lib/sql_algebra/relations/relation.rb
new file mode 100644
index 0000000000..f1f8fc5884
--- /dev/null
+++ b/lib/sql_algebra/relations/relation.rb
@@ -0,0 +1,13 @@
+class Relation
+  def *(other)
+    JoinOperation.new(self, other)
+  end
+  
+  def [](attribute_name)
+    Attribute.new(self, attribute_name)
+  end
+  
+  def include?(attribute)
+    RelationInclusionPredicate.new(attribute, self)
+  end
+end
+\ No newline at end of file