diff --git a/data/maker/__init__.py b/data/maker/__init__.py
index e2a072a..b7608d7 100644
--- a/data/maker/__init__.py
+++ b/data/maker/__init__.py
@@ -411,7 +411,7 @@ class Generator (Learner):
                         _df[name] = _dates
             _schema = self.get_schema()
             _schema = [{'name':_item.name,'type':_item.field_type} for _item in _schema]
-            writer.write(_df[['birth_datetime']+self.columns],schema=_schema)
+            writer.write(_df[self.columns],schema=_schema)
         pass
 class factory :
     _infocache = {}