diff --git a/include/sqlpp11/column.h b/include/sqlpp11/column.h
index da6f5b6e..51608433 100644
--- a/include/sqlpp11/column.h
+++ b/include/sqlpp11/column.h
@@ -32,7 +32,6 @@
 #include <sqlpp11/operator/assign_expression.h>
 #include <sqlpp11/column_fwd.h>
 #include <sqlpp11/default_value.h>
-#include <sqlpp11/sort_order.h>
 #include <sqlpp11/type_traits.h>
 #include <sqlpp11/wrong.h>
 #include <sqlpp11/detail/type_set.h>
diff --git a/include/sqlpp11/enable_comparison.h b/include/sqlpp11/enable_comparison.h
index e9d5f4de..eede5d96 100644
--- a/include/sqlpp11/enable_comparison.h
+++ b/include/sqlpp11/enable_comparison.h
@@ -28,6 +28,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <sqlpp11/operator/comparison_expression.h>
 #include <sqlpp11/operator/in_expression.h>
+#include <sqlpp11/operator/sort_order_expression.h>
 #include <sqlpp11/type_traits.h>
 
 namespace sqlpp
@@ -100,6 +101,21 @@ namespace sqlpp
       return ::sqlpp::is_not_distinct_from(this->derived(), std::move(r));
     }
 
+    constexpr auto asc() const ->sort_order_expression<Expr>
+    {
+      return ::sqlpp::asc(this->derived());
+    }
+
+    constexpr auto desc() const ->sort_order_expression<Expr>
+    {
+      return ::sqlpp::desc(this->derived());
+    }
+
+    constexpr auto order(::sqlpp::sort_type t) const ->sort_order_expression<Expr>
+    {
+      return ::sqlpp::order(this->derived(), t);
+    }
+
   };
 
 }  // namespace sqlpp
diff --git a/include/sqlpp11/having.h b/include/sqlpp11/having.h
index 529aa13b..d940d70a 100644
--- a/include/sqlpp11/having.h
+++ b/include/sqlpp11/having.h
@@ -90,9 +90,6 @@ namespace sqlpp
     };
   };
 
-  SQLPP_PORTABLE_STATIC_ASSERT(assert_having_not_cpp_bool_t,
-                               "having() argument has to be an sqlpp boolean expression. Please use "
-                               "sqlpp::value(bool_expresson) if you really want to use a bool value here");
   SQLPP_PORTABLE_STATIC_ASSERT(assert_having_boolean_expression_t,
                                "having() argument has to be an sqlpp boolean expression.");
 
@@ -100,9 +97,7 @@ namespace sqlpp
   struct check_having
   {
     using type =
-        static_combined_check_t<static_check_t<is_not_cpp_bool_t<Expression>::value, assert_having_not_cpp_bool_t>,
-                                static_check_t<is_expression_t<Expression>::value, assert_having_boolean_expression_t>,
-                                static_check_t<is_boolean<Expression>::value, assert_having_boolean_expression_t>>;
+        static_combined_check_t<static_check_t<is_boolean<Expression>::value, assert_having_boolean_expression_t>>;
   };
 
   template <typename Expression>
diff --git a/include/sqlpp11/insert_value.h b/include/sqlpp11/insert_value.h
index c499cdcb..b837ae5c 100644
--- a/include/sqlpp11/insert_value.h
+++ b/include/sqlpp11/insert_value.h
@@ -56,22 +56,15 @@ namespace sqlpp
   struct insert_value_t
   {
     using _is_insert_value = std::true_type;
-    using _column_t = Column;
-    using _pure_value_t = typename value_type_of_t<Column>::_cpp_value_type;
-    using _value_t = value_t<typename Column::_traits::_value_type>;
+    using _value_t = parameter_value_t<value_type_of_t<Column>>;
 
-    insert_value_t(_pure_value_t rhs)
-        : _is_null(false), _is_default(false), _value(rhs._t)
+    insert_value_t(_value_t value)
+        : _is_default(false), _value(std::move(value))
     {
     }
 
     insert_value_t(const default_value_t& /*unused*/)
-        : _is_null(false), _is_default(true), _value{}
-    {
-    }
-
-    insert_value_t(const _value_t& rhs)
-        : _is_null(rhs._is_null), _is_default(false), _value{rhs._value}
+        : _is_default(true), _value{}
     {
     }
 
@@ -81,19 +74,14 @@ namespace sqlpp
     insert_value_t& operator=(insert_value_t&&) = default;
     ~insert_value_t() = default;
 
-    bool _is_null;
     bool _is_default;
-    _pure_value_t _value;
+    _value_t _value;
   };
 
   template <typename Context, typename ValueType>
-  Context& serialize(Context& context, const insert_value_t<ValueType>& t)
+  auto serialize(Context& context, const insert_value_t<ValueType>& t) -> Context&
   {
-    if (t._is_null)
-    {
-      context << "NULL";
-    }
-    else if (t._is_default)
+    if (t._is_default)
     {
       context << "DEFAULT";
     }
diff --git a/include/sqlpp11/insert_value_list.h b/include/sqlpp11/insert_value_list.h
index 381a0466..df63969a 100644
--- a/include/sqlpp11/insert_value_list.h
+++ b/include/sqlpp11/insert_value_list.h
@@ -271,7 +271,7 @@ namespace sqlpp
       template <typename... Assignments>
       void _add_impl(const std::true_type& /*unused*/, Assignments... assignments)
       {
-        _data._insert_values.emplace_back(insert_value_t<lhs_t<Assignments>>{assignments._rhs}...);
+        _data._insert_values.emplace_back(insert_value_t<lhs_t<Assignments>>{assignments._r}...);
       }
 
       template <typename... Assignments>
diff --git a/include/sqlpp11/operator/sort_order_expression.h b/include/sqlpp11/operator/sort_order_expression.h
index 8aff5fb9..6ec3f0f2 100644
--- a/include/sqlpp11/operator/sort_order_expression.h
+++ b/include/sqlpp11/operator/sort_order_expression.h
@@ -32,7 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 namespace sqlpp
 {
-  enum class sort_order
+  enum class sort_type
   {
     asc,
     desc,
@@ -41,7 +41,7 @@ namespace sqlpp
   template <typename L>
   struct sort_order_expression
   {
-    constexpr sort_order_expression(L l, sort_order r) : _l(std::move(l)), _r(std::move(r))
+    constexpr sort_order_expression(L l, sort_type r) : _l(std::move(l)), _r(std::move(r))
     {
     }
     sort_order_expression(const sort_order_expression&) = default;
@@ -51,58 +51,76 @@ namespace sqlpp
     ~sort_order_expression() = default;
 
     L _l;
-    sort_order _r;
+    sort_type _r;
   };
 
   template <typename L>
   using check_sort_order_args = std::enable_if_t<values_are_comparable<L, L>::value>;
 
   template <typename L>
-  struct nodes_of<sort_order_t<L>>
+  struct nodes_of<sort_order_expression<L>>
   {
     using type = detail::type_vector<L>;
   };
 
+  template <typename L>
+  struct is_sort_order<sort_order_expression<L>> : std::true_type {};
+
   /*
   template <typename L>
   constexpr auto requires_braces_v<sort_order_t<L>> = false;
 
-  template <typename L>
-  constexpr auto is_sort_order_v<sort_order_t<L>> = true;
-
   template <typename Context>
-  [[nodiscard]] auto to_sql_string(Context& context, const sort_order& t)
+  [[nodiscard]] auto to_sql_string(Context& context, const sort_type& t)
   {
     switch (t)
     {
-      case sort_order::asc:
+      case sort_type::asc:
         return std::string(" ASC");
-      case sort_order::desc:
+      case sort_type::desc:
         return std::string(" DESC");
     }
   }
 
-  template <typename Context, typename L>
-  [[nodiscard]] auto to_sql_string(Context& context, const sort_order_t<L>& t)
-  {
-    return to_sql_string(context, embrace(t.l)) + to_sql_string(context, t.order);
-  }
   */
 
+  template <typename Context>
+  auto serialize(Context& context, const sort_type& t) -> Context&
+  {
+    switch (t)
+    {
+      case sort_type::asc:
+        context << " ASC";
+        break;
+      case sort_type::desc:
+        context << " DESC";
+        break;
+    }
+    return context;
+  }
+
+  template <typename Context, typename L>
+  auto serialize(Context& context, const sort_order_expression<L>& t) -> Context&
+  {
+    serialize_operand(context, t._l);
+    serialize(context, t._r);
+    return context;
+  }
+
   template <typename L, typename = check_sort_order_args<L>>
   constexpr auto asc(L l) -> sort_order_expression<L>
   {
-    return {l, sort_order::asc};
+    return {l, sort_type::asc};
   }
 
   template <typename L, typename = check_sort_order_args<L>>
   constexpr auto desc(L l) -> sort_order_expression<L>
   {
-    return {l, sort_order::desc};
+    return {l, sort_type::desc};
   }
 
   template <typename L, typename = check_sort_order_args<L>>
-  constexpr auto order(L l, sort_order order) -> sort_order_expression<L>
+  constexpr auto order(L l, sort_type order) -> sort_order_expression<L>
   {
     return {l, order};
   }
diff --git a/include/sqlpp11/order_by.h b/include/sqlpp11/order_by.h
index 2fb20e02..f3eb33e3 100644
--- a/include/sqlpp11/order_by.h
+++ b/include/sqlpp11/order_by.h
@@ -86,7 +86,7 @@ namespace sqlpp
   template <typename... Exprs>
   struct check_order_by
   {
-    using type = static_combined_check_t<static_check_t<logic::all_t<is_sort_order_t<Exprs>::value...>::value,
+    using type = static_combined_check_t<static_check_t<logic::all_t<is_sort_order<Exprs>::value...>::value,
                                                         assert_order_by_args_are_sort_order_expressions_t>>;
   };
   template <typename... Exprs>
@@ -124,7 +124,7 @@ namespace sqlpp
       {
         static_assert(sizeof...(Expressions), "at least one expression (e.g. a column) required in order_by()");
 
-        return _order_by_impl(check_order_by_t<Expressions...>{}, expressions...);
+        return _order_by_impl(check_order_by_t<Expressions...>{}, std::move(expressions)...);
       }
 
     private:
@@ -139,7 +139,7 @@ namespace sqlpp
                       "at least one duplicate argument detected in order_by()");
 
         return {static_cast<const derived_statement_t<Policies>&>(*this),
-                order_by_data_t<Expressions...>{expressions...}};
+                order_by_data_t<Expressions...>{std::move(expressions)...}};
       }
     };
   };
@@ -154,9 +154,9 @@ namespace sqlpp
   }
 
   template <typename... T>
-  auto order_by(T&&... t) -> decltype(statement_t<no_order_by_t>().order_by(std::forward<T>(t)...))
+  auto order_by(T... t) -> decltype(statement_t<no_order_by_t>().order_by(std::forward<T>(t)...))
   {
-    return statement_t<no_order_by_t>().order_by(std::forward<T>(t)...);
+    return statement_t<no_order_by_t>().order_by(std::move(t)...);
   }
 
 }  // namespace sqlpp
diff --git a/include/sqlpp11/sort_order.h b/include/sqlpp11/sort_order.h
deleted file mode 100644
index 9a67adfa..00000000
--- a/include/sqlpp11/sort_order.h
+++ /dev/null
@@ -1,66 +0,0 @@
-#pragma once
-
-/*
- * Copyright (c) 2013-2015, Roland Bock
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- *   Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- *
- *   Redistributions in binary form must reproduce the above copyright notice, this
- *   list of conditions and the following disclaimer in the documentation and/or
- *   other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <sqlpp11/detail/type_set.h>
-
-namespace sqlpp
-{
-  struct no_value_t;
-
-  enum class sort_type
-  {
-    asc,
-    desc
-  };
-
-  template <typename Expression>
-  struct sort_order_t
-  {
-    using _traits = make_traits<no_value_t, tag::is_sort_order>;
-    using _nodes = detail::type_vector<Expression>;
-
-    Expression _expression;
-    sort_type _sort_type;
-  };
-
-  template <typename Context, typename Expression>
-  Context& serialize(Context& context, const sort_order_t<Expression>& t)
-  {
-    serialize_operand(context, t._expression);
-    switch (t._sort_type)
-    {
-      case sort_type::asc:
-        context << " ASC";
-        break;
-      default:
-        context << " DESC";
-        break;
-    }
-    return context;
-  }
-}  // namespace sqlpp
diff --git a/include/sqlpp11/type_traits.h b/include/sqlpp11/type_traits.h
index 31d8cae7..8b7176a8 100644
--- a/include/sqlpp11/type_traits.h
+++ b/include/sqlpp11/type_traits.h
@@ -404,7 +404,7 @@ namespace sqlpp
     struct parameter_value<unsigned_integral> { using type = uint64_t; };
 
   template<>
-    struct parameter_value<floating_point> { using type = floating_point; };
+    struct parameter_value<floating_point> { using type = double; };
 
   template<>
     struct parameter_value<text> { using type = std::string; };
@@ -491,7 +491,6 @@ namespace sqlpp
   SQLPP_VALUE_TRAIT_GENERATOR(is_insert_list)
   SQLPP_VALUE_TRAIT_GENERATOR(is_insert_value)
   SQLPP_VALUE_TRAIT_GENERATOR(is_insert_value_list)
-  SQLPP_VALUE_TRAIT_GENERATOR(is_sort_order)
   SQLPP_VALUE_TRAIT_GENERATOR(is_parameter)
 
   SQLPP_VALUE_TRAIT_GENERATOR(requires_parens)
@@ -875,6 +874,10 @@ namespace sqlpp
     using type = typename Db::_serializer_context_t;
   };
 
+  template <typename T>
+    struct is_sort_order : public std::false_type {};
+
+
   template <typename Db>
   using serializer_context_of = typename serializer_context_of_impl<Db>::type;
 }  // namespace sqlpp
diff --git a/tests/core/serialize/CMakeLists.txt b/tests/core/serialize/CMakeLists.txt
index 63f20580..1627c069 100644
--- a/tests/core/serialize/CMakeLists.txt
+++ b/tests/core/serialize/CMakeLists.txt
@@ -29,7 +29,7 @@ set(test_files
     Avg.cpp
     Blob.cpp
     Count.cpp
-    #CustomQuery.cpp
+    CustomQuery.cpp
     DynamicWhere.cpp
     Exists.cpp
     Float.cpp
diff --git a/tests/core/serialize/CustomQuery.cpp b/tests/core/serialize/CustomQuery.cpp
index e65aec80..ffa2da65 100644
--- a/tests/core/serialize/CustomQuery.cpp
+++ b/tests/core/serialize/CustomQuery.cpp
@@ -47,8 +47,8 @@ int CustomQuery(int, char*[])
           custom_query(sqlpp::select(), select_flags(sqlpp::distinct), select_columns(foo.doubleN),
                        from(foo.join(bar).on(foo.doubleN == bar.id)), where(bar.id > 17), group_by(foo.doubleN),
                        having(avg(bar.id) > 19), order_by(foo.doubleN.asc()), sqlpp::limit(10u), sqlpp::offset(100u)),
-          "SELECT  DISTINCT  tab_foo.double_n  FROM tab_foo INNER JOIN tab_bar ON (tab_foo.double_n=tab_bar.id)  WHERE "
-          "(tab_bar.id>17)  GROUP BY tab_foo.double_n  HAVING (AVG(tab_bar.id)>19)  ORDER BY tab_foo.double_n ASC  "
+          "SELECT  DISTINCT  tab_foo.double_n  FROM tab_foo INNER JOIN tab_bar ON (tab_foo.double_n = tab_bar.id)  WHERE "
+          "(tab_bar.id > 17)  GROUP BY tab_foo.double_n  HAVING (AVG(tab_bar.id) > 19)  ORDER BY tab_foo.double_n ASC  "
           "LIMIT 10  OFFSET 100");
 
   // A full select statement made individual clauses
@@ -59,8 +59,8 @@ int CustomQuery(int, char*[])
                    group_by(foo.doubleN), having(avg(bar.id) > 19),
                    order_by(foo.doubleN.asc(), foo.uIntN.order(sqlpp::sort_type::desc)),
                    sqlpp::limit(7u), sqlpp::offset(3u)),
-      "SELECT  DISTINCT  tab_foo.double_n  FROM tab_foo INNER JOIN tab_bar ON (tab_foo.double_n=tab_bar.id)  WHERE "
-      "(tab_bar.id>17)  GROUP BY tab_foo.double_n  HAVING (AVG(tab_bar.id)>19)  ORDER BY tab_foo.double_n "
+      "SELECT  DISTINCT  tab_foo.double_n  FROM tab_foo INNER JOIN tab_bar ON (tab_foo.double_n = tab_bar.id)  WHERE "
+      "(tab_bar.id > 17)  GROUP BY tab_foo.double_n  HAVING (AVG(tab_bar.id) > 19)  ORDER BY tab_foo.double_n "
       "ASC,tab_foo.u_int_n DESC  LIMIT 7  OFFSET 3");
 
   // A pragma query for sqlite
@@ -77,7 +77,7 @@ int CustomQuery(int, char*[])
                            .where(not exists(select(foo.doubleN).from(foo).where(foo.doubleN == x)))),
           "INSERT INTO tab_foo (double_n) "
           "SELECT 17 AS double_n FROM tab_foo "
-          "WHERE (NOT EXISTS(SELECT tab_foo.double_n FROM tab_foo WHERE (tab_foo.double_n=17)))");
+          "WHERE (NOT EXISTS(SELECT tab_foo.double_n FROM tab_foo WHERE (tab_foo.double_n = 17)))");
 
   // A multi-row "insert or ignore"
   auto batch = insert_columns(bar.textN, bar.boolNn);