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diff --git a/odb/relational/common-query.hxx b/odb/relational/common-query.hxx
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+// file      : odb/relational/common-query.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_RELATIONAL_COMMON_QUERY_HXX
+#define ODB_RELATIONAL_COMMON_QUERY_HXX
+
+#include <odb/relational/common.hxx>
+
+namespace relational
+{
+  //
+  //
+  struct query_alias_traits: ::query_alias_traits, virtual context
+  {
+    typedef query_alias_traits base_impl;
+
+    query_alias_traits (base const& x): base (x) {}
+
+    virtual void
+    generate_decl_body ();
+
+    virtual void
+    generate_def (semantics::data_member&, semantics::class_&);
+
+    virtual void
+    generate_def (string const& tag, semantics::class_&, string const& alias);
+  };
+
+  //
+  //
+  struct query_columns_base: ::query_columns_base, virtual context
+  {
+    typedef query_columns_base base_impl;
+
+    query_columns_base (base const& x): base (x) {const_ = "const ";}
+  };
+
+  //
+  //
+  struct query_columns: ::query_columns, virtual context
+  {
+    typedef query_columns base_impl;
+
+    query_columns (base const& x): base (x) {const_ = "const ";}
+
+    virtual string
+    database_type_id (semantics::data_member&) = 0;
+
+    virtual void
+    column_ctor (string const& type, string const& name, string const& base);
+
+    virtual void
+    column_ctor_args_extra (semantics::data_member&);
+
+    virtual void
+    column_common (semantics::data_member&,
+                   string const& type,
+                   string const& column,
+                   string const& suffix);
+  };
+}
+
+#endif // ODB_RELATIONAL_COMMON_QUERY_HXX