diff --git a/include/sqlpp11/basic_expression_operators.h b/include/sqlpp11/basic_expression_operators.h
index 3b66a8ae..5f8e211e 100644
--- a/include/sqlpp11/basic_expression_operators.h
+++ b/include/sqlpp11/basic_expression_operators.h
@@ -218,6 +218,27 @@ namespace sqlpp
       check_rhs_in_arguments_t<ValueType, wrap_operand_t<T>...>::_();
       return {*static_cast<const Expr*>(this), wrap_operand_t<T>{t}...};
     }
+
+    template <typename Defer = void>
+    auto operator not() const -> return_type_not_t<Expr, Defer>
+    {
+      return_type_not<Expr, Defer>::check::_();
+      return {*static_cast<const Expr*>(this)};
+    }
+
+    template <typename R>
+    auto operator and(const R& r) const -> return_type_and_t<Expr, R>
+    {
+      return_type_and<Expr, R>::check::_();
+      return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
+    }
+
+    template <typename R>
+    auto operator or(const R& r) const -> return_type_or_t<Expr, R>
+    {
+      return_type_or<Expr, R>::check::_();
+      return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
+    }
   };
 }
 
diff --git a/include/sqlpp11/data_types/boolean/data_type.h b/include/sqlpp11/data_types/boolean/data_type.h
index 25f6d1f5..66528c63 100644
--- a/include/sqlpp11/data_types/boolean/data_type.h
+++ b/include/sqlpp11/data_types/boolean/data_type.h
@@ -33,7 +33,7 @@ namespace sqlpp
 {
   struct boolean
   {
-    // using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<boolean, tag::is_value_type>;
     using _cpp_value_type = bool;
 
     template <typename T>
diff --git a/include/sqlpp11/data_types/boolean/expression_operators.h b/include/sqlpp11/data_types/boolean/expression_operators.h
index 7d934910..1e890b3e 100644
--- a/include/sqlpp11/data_types/boolean/expression_operators.h
+++ b/include/sqlpp11/data_types/boolean/expression_operators.h
@@ -27,7 +27,7 @@
 #ifndef SQLPP_BOOLEAN_EXPRESSION_OPERATORS_H
 #define SQLPP_BOOLEAN_EXPRESSION_OPERATORS_H
 
-#include <sqlpp11/operators.h>
+//#include <sqlpp11/operators.h>
 #include <sqlpp11/expression_return_types.h>
 #include <sqlpp11/operand_check.h>
 #include <sqlpp11/expression_operators.h>
@@ -54,8 +54,8 @@ namespace sqlpp
     using type = logical_or_t<wrap_operand_t<L>, wrap_operand_t<R>>;
   };
 
-  template <typename T>
-  struct return_type_not<T, unary_operand_check_t<T, is_boolean_t>>
+  template <typename T, typename Defer>
+  struct return_type_not<T, Defer, unary_operand_check_t<T, is_boolean_t>>
   {
     using check = consistent_t;
     using type = logical_not_t<wrap_operand_t<T>>;
diff --git a/include/sqlpp11/data_types/day_point/data_type.h b/include/sqlpp11/data_types/day_point/data_type.h
index 0a2b1df1..a589e752 100644
--- a/include/sqlpp11/data_types/day_point/data_type.h
+++ b/include/sqlpp11/data_types/day_point/data_type.h
@@ -34,7 +34,7 @@ namespace sqlpp
 {
   struct day_point
   {
-    using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<day_point, tag::is_value_type>;
     using _cpp_value_type = ::sqlpp::chrono::day_point;
 
     template <typename T>
diff --git a/include/sqlpp11/data_types/floating_point/data_type.h b/include/sqlpp11/data_types/floating_point/data_type.h
index 418b89bb..6c7e6a2f 100644
--- a/include/sqlpp11/data_types/floating_point/data_type.h
+++ b/include/sqlpp11/data_types/floating_point/data_type.h
@@ -33,7 +33,7 @@ namespace sqlpp
 {
   struct floating_point
   {
-    using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<floating_point, tag::is_value_type>;
     using _cpp_value_type = double;
 
     template <typename T>
diff --git a/include/sqlpp11/data_types/integral/data_type.h b/include/sqlpp11/data_types/integral/data_type.h
index 550421d4..cc60e273 100644
--- a/include/sqlpp11/data_types/integral/data_type.h
+++ b/include/sqlpp11/data_types/integral/data_type.h
@@ -33,7 +33,7 @@ namespace sqlpp
 {
   struct integral
   {
-    using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<integral, tag::is_value_type>;
     using _cpp_value_type = int64_t;
 
     template <typename T>
diff --git a/include/sqlpp11/data_types/text/data_type.h b/include/sqlpp11/data_types/text/data_type.h
index 7356342d..7b90b5e0 100644
--- a/include/sqlpp11/data_types/text/data_type.h
+++ b/include/sqlpp11/data_types/text/data_type.h
@@ -33,7 +33,7 @@ namespace sqlpp
 {
   struct text
   {
-    using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<text, tag::is_value_type>;
     using _cpp_value_type = std::string;
 
     template <typename T>
diff --git a/include/sqlpp11/data_types/time_point/data_type.h b/include/sqlpp11/data_types/time_point/data_type.h
index 89e02619..f4507a03 100644
--- a/include/sqlpp11/data_types/time_point/data_type.h
+++ b/include/sqlpp11/data_types/time_point/data_type.h
@@ -34,7 +34,7 @@ namespace sqlpp
 {
   struct time_point
   {
-    using _traits = make_traits<void, tag::is_value_type>;
+    using _traits = make_traits<time_point, tag::is_value_type>;
     using _cpp_value_type = ::sqlpp::chrono::mus_point;
 
     template <typename T>
diff --git a/include/sqlpp11/expression_return_types.h b/include/sqlpp11/expression_return_types.h
index 7b2a27af..43f31ae4 100644
--- a/include/sqlpp11/expression_return_types.h
+++ b/include/sqlpp11/expression_return_types.h
@@ -51,15 +51,15 @@ namespace sqlpp
   template <typename L, typename R>
   using return_type_or_t = typename return_type_or<L, R>::type;
 
-  template <typename T, typename Enable = void>
+  template <typename T, typename Defer, typename Enable = void>
   struct return_type_not
   {
     using check = assert_valid_operands;
     using type = bad_expression<boolean>;
   };
 
-  template <typename T>
-  using return_type_not_t = typename return_type_not<T>::type;
+  template <typename T, typename Defer>
+  using return_type_not_t = typename return_type_not<T, Defer>::type;
 }
 
 #endif
diff --git a/tests/BooleanExpression.cpp b/tests/BooleanExpression.cpp
index c3b9daa1..ad1b668d 100644
--- a/tests/BooleanExpression.cpp
+++ b/tests/BooleanExpression.cpp
@@ -35,7 +35,7 @@ int BooleanExpression(int, char**)
 
   auto x = boolean_expression(db, not(t.alpha == 7));
   x = sqlpp::boolean_expression<MockDb>(t.beta.like("%cheesecake"));
-  x = false or (x and boolean_expression(db, t.gamma));
+  x = x and boolean_expression(db, t.gamma);
 
   db(select(t.alpha).from(t).where(x));