Oracle does not support `IF EXISTS` for `DROP VIEW`.

/cc @yahonda

activerecord/test/cases/view_test.rb

@@ -18,7 +18,7 @@ class Ebook < ActiveRecord::Base
   end
 
   teardown do
-    @connection.execute "DROP VIEW IF EXISTS ebooks"
+    @connection.execute "DROP VIEW ebooks" if @connection.table_exists? "ebooks"
   end
 
   def test_reading
@@ -65,7 +65,7 @@ class Paperback < ActiveRecord::Base; end
   end
 
   teardown do
-    @connection.execute "DROP VIEW IF EXISTS paperbacks"
+    @connection.execute "DROP VIEW paperbacks" if @connection.table_exists? "paperbacks"
   end
 
   def test_reading