diff --git a/include/sqlpp11/core/basic/column.h b/include/sqlpp11/core/basic/column.h
index 6f9f2463..4e74fdba 100644
--- a/include/sqlpp11/core/basic/column.h
+++ b/include/sqlpp11/core/basic/column.h
@@ -104,10 +104,13 @@ namespace sqlpp
   {
   };
 
+  template<typename Table>
+    struct table_t;
+
   template<typename Table, typename ColumnSpec>
   struct required_tables_of<column_t<Table, ColumnSpec>>
   {
-    using type = detail::type_set<Table>;
+    using type = detail::type_set<table_t<Table>>;
   };
 
   template <typename Context, typename Table, typename ColumnSpec>
diff --git a/include/sqlpp11/core/basic/join.h b/include/sqlpp11/core/basic/join.h
index ca3d9905..f1f57bf4 100644
--- a/include/sqlpp11/core/basic/join.h
+++ b/include/sqlpp11/core/basic/join.h
@@ -1,7 +1,7 @@
 #pragma once
 
 /*
- * Copyright (c) 2013-2016, Roland Bock
+ * Copyright (c) 2013, Roland Bock
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
@@ -38,7 +38,7 @@ namespace sqlpp
     using _traits = make_traits<no_value_t, tag::is_join>;
     using _nodes = detail::type_vector<PreJoin, On>;
     using _can_be_null = std::false_type;
-    using _provided_tables = provided_tables_of<PreJoin>;
+    using _provided_tables = provided_tables_of_t<PreJoin>;
     using _required_tables = detail::make_difference_set_t<required_tables_of_t<On>, _provided_tables>;
 
     template <typename T>
@@ -81,6 +81,18 @@ namespace sqlpp
     On _on;
   };
 
+  template<typename PreJoin, typename On>
+    struct nodes_of<join_t<PreJoin, On>>
+    {
+      using type = sqlpp::detail::type_vector<PreJoin, On>;
+    };
+
+  template<typename PreJoin, typename On>
+    struct provided_outer_tables_of<join_t<PreJoin, On>>
+    {
+      using type = provided_outer_tables_of_t<PreJoin>;
+    };
+
   template<typename PreJoin, typename On>
     struct is_table<join_t<PreJoin, On>> : public std::true_type{};
 
diff --git a/include/sqlpp11/core/basic/join_types.h b/include/sqlpp11/core/basic/join_types.h
index de984092..95e7448d 100644
--- a/include/sqlpp11/core/basic/join_types.h
+++ b/include/sqlpp11/core/basic/join_types.h
@@ -34,28 +34,28 @@ namespace sqlpp
   {
     template <typename Lhs, typename Rhs>
     using _provided_outer_tables =
-        detail::make_joined_set_t<provided_outer_tables_of<Lhs>, provided_outer_tables_of<Rhs>>;
+        detail::make_joined_set_t<provided_outer_tables_of_t<Lhs>, provided_outer_tables_of_t<Rhs>>;
 
     static constexpr const char* _name = " INNER";
   };
   struct outer_join_t
   {
     template <typename Lhs, typename Rhs>
-    using _provided_outer_tables = detail::make_joined_set_t<provided_tables_of<Lhs>, provided_tables_of<Rhs>>;
+    using _provided_outer_tables = detail::make_joined_set_t<provided_tables_of_t<Lhs>, provided_tables_of_t<Rhs>>;
 
     static constexpr const char* _name = " OUTER";
   };
   struct left_outer_join_t
   {
     template <typename Lhs, typename Rhs>
-    using _provided_outer_tables = detail::make_joined_set_t<provided_outer_tables_of<Lhs>, provided_tables_of<Rhs>>;
+    using _provided_outer_tables = detail::make_joined_set_t<provided_outer_tables_of_t<Lhs>, provided_tables_of_t<Rhs>>;
 
     static constexpr const char* _name = " LEFT OUTER";
   };
   struct right_outer_join_t
   {
     template <typename Lhs, typename Rhs>
-    using _provided_outer_tables = detail::make_joined_set_t<provided_tables_of<Lhs>, provided_outer_tables_of<Rhs>>;
+    using _provided_outer_tables = detail::make_joined_set_t<provided_tables_of_t<Lhs>, provided_outer_tables_of_t<Rhs>>;
 
     static constexpr const char* _name = " RIGHT OUTER";
   };
@@ -63,7 +63,7 @@ namespace sqlpp
   {
     template <typename Lhs, typename Rhs>
     using _provided_outer_tables =
-        detail::make_joined_set_t<provided_outer_tables_of<Lhs>, provided_outer_tables_of<Rhs>>;
+        detail::make_joined_set_t<provided_outer_tables_of_t<Lhs>, provided_outer_tables_of_t<Rhs>>;
 
     static constexpr const char* _name = " CROSS";
   };
diff --git a/include/sqlpp11/core/basic/on.h b/include/sqlpp11/core/basic/on.h
index dad05a16..ed5f7d5c 100644
--- a/include/sqlpp11/core/basic/on.h
+++ b/include/sqlpp11/core/basic/on.h
@@ -60,6 +60,12 @@ namespace sqlpp
     using _nodes = detail::type_vector<>;
   };
 
+  template<typename Expression>
+    struct nodes_of<on_t<Expression>>
+    {
+      using type = sqlpp::detail::type_vector<Expression>;
+    };
+
   template <typename Context>
   auto to_sql_string(Context& , const on_t<unconditional_t>&) -> std::string
   {
diff --git a/include/sqlpp11/core/basic/pre_join.h b/include/sqlpp11/core/basic/pre_join.h
index 0a635092..3c9b1493 100644
--- a/include/sqlpp11/core/basic/pre_join.h
+++ b/include/sqlpp11/core/basic/pre_join.h
@@ -1,7 +1,7 @@
 #pragma once
 
 /*
- * Copyright (c) 2013-2016, Roland Bock
+ * Copyright (c) 2013, Roland Bock
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
@@ -28,6 +28,7 @@
 
 #include <sqlpp11/core/basic/join_types.h>
 #include <sqlpp11/core/noop.h>
+#include <sqlpp11/core/query/dynamic.h>
 #include <sqlpp11/core/basic/on.h>
 #include <sqlpp11/core/basic/table_ref.h>
 
@@ -45,8 +46,9 @@ namespace sqlpp
         static_check_t<is_table<Lhs>::value, assert_pre_join_lhs_table_t>,
         static_check_t<is_table<Rhs>::value, assert_pre_join_rhs_table_t>,
         static_check_t<not is_join_t<Rhs>::value, assert_pre_join_rhs_no_join_t>,
-        static_check_t<detail::is_disjunct_from<detail::make_name_of_set_t<provided_tables_of<Lhs>>,
-                                                detail::make_name_of_set_t<provided_tables_of<Rhs>>>::value,
+#warning: Since rhs is a table, we could also just get a type vector here.
+        static_check_t<detail::is_disjunct_from<detail::make_name_of_set_t<provided_tables_of_t<Lhs>>,
+                                                detail::make_name_of_set_t<provided_tables_of_t<Rhs>>>::value,
                        assert_pre_join_unique_names_t>>;
   };
 
@@ -66,7 +68,7 @@ namespace sqlpp
         static_check_t<is_pre_join_t<PreJoin>::value, assert_join_consist_of_pre_join_and_on_t>,
         static_check_t<is_on_t<On>::value, assert_join_consist_of_pre_join_and_on_t>,
         static_check_t<required_tables_of_t<PreJoin>::size::value == 0, assert_join_no_table_dependencies_t>,
-        static_check_t<detail::is_subset_of<required_tables_of_t<On>, provided_tables_of<PreJoin>>::value,
+        static_check_t<detail::is_subset_of<required_tables_of_t<On>, provided_tables_of_t<PreJoin>>::value,
                        assert_join_on_no_foreign_table_dependencies_t>>;
   };
 
@@ -93,13 +95,7 @@ namespace sqlpp
     using _can_be_null = std::false_type;
     using _provided_outer_tables = typename JoinType::template _provided_outer_tables<Lhs, Rhs>;
 
-    static_assert(is_table<Lhs>::value, "lhs argument for join() has to be a table or join");
-    static_assert(is_table<Rhs>::value, "rhs argument for join() has to be a table");
-    static_assert(not is_join_t<Rhs>::value, "rhs argument for join must not be a join");
-
-    static_assert(detail::is_disjunct_from<provided_tables_of<Lhs>, provided_tables_of<Rhs>>::value,
-                  "joined tables must not be identical");
-
+#warning: Do we really need this?
     static_assert(required_tables_of_t<pre_join_t>::size::value == 0, "joined tables must not depend on other tables");
 
     auto unconditionally() -> join_t<pre_join_t, on_t<unconditional_t>>
@@ -132,6 +128,19 @@ namespace sqlpp
     Rhs _rhs;
   };
 
+  template <typename JoinType, typename Lhs, typename Rhs>
+    struct nodes_of<pre_join_t<JoinType, Lhs, Rhs>>
+    {
+      using type = sqlpp::detail::type_vector<Lhs, Rhs>;
+    };
+
+  template <typename JoinType, typename Lhs, typename Rhs>
+    struct provided_outer_tables_of<pre_join_t<JoinType, Lhs, Rhs>>
+    {
+      using type = typename JoinType::template _provided_outer_tables<Lhs, Rhs>;
+    };
+
+
   template <typename Context, typename JoinType, typename Lhs, typename Rhs>
   auto to_sql_string(Context& context, const pre_join_t<JoinType, Lhs, Rhs>& t) -> std::string
   {
@@ -147,7 +156,7 @@ namespace sqlpp
     auto join_impl(consistent_t, Lhs lhs, Rhs rhs) -> pre_join_t<JoinType, from_table_t<Lhs>, from_table_t<Rhs>>;
 
     template <typename JoinType, typename Lhs, typename Rhs>
-    auto join_impl(Lhs lhs, Rhs rhs) -> decltype(join_impl<JoinType>(check_pre_join_t<Lhs, Rhs>{}, lhs, rhs));
+    auto join_impl(Lhs lhs, Rhs rhs) -> decltype(join_impl<JoinType>(check_pre_join_t<Lhs, remove_dynamic_t<Rhs>>{}, lhs, rhs));
   }  // namespace detail
 
   template <typename Lhs, typename Rhs>
diff --git a/include/sqlpp11/core/basic/table.h b/include/sqlpp11/core/basic/table.h
index 02f801a3..e4fb1179 100644
--- a/include/sqlpp11/core/basic/table.h
+++ b/include/sqlpp11/core/basic/table.h
@@ -41,9 +41,6 @@ namespace sqlpp
   {
     using _traits = make_traits<no_value_t, tag::is_raw_table>;
 
-    using _nodes = detail::type_vector<>;
-    using _provided_tables = detail::type_set<TableSpec>;
-
     using _required_insert_columns = typename TableSpec::_required_insert_columns;
 #warning: Need to inherit?
     //using _column_tuple_t = std::tuple<column_t<Table, ColumnSpec>...>;
@@ -66,6 +63,12 @@ namespace sqlpp
   template <typename TableSpec>
   struct is_table<table_t<TableSpec>>: public std::true_type {};
 
+  template <typename TableSpec>
+  struct provided_tables_of<table_t<TableSpec>>
+  {
+    using type = sqlpp::detail::type_set<table_t<TableSpec>>;
+  };
+
   template <typename Context, typename TableSpec>
   auto to_sql_string(Context& context, const table_t<TableSpec>& /*unused*/) -> std::string
   {
diff --git a/include/sqlpp11/core/clause/from.h b/include/sqlpp11/core/clause/from.h
index d4732362..c3e5e0e2 100644
--- a/include/sqlpp11/core/clause/from.h
+++ b/include/sqlpp11/core/clause/from.h
@@ -85,8 +85,8 @@ namespace sqlpp
         static_check_t<not is_pre_join_t<Table>::value, assert_from_not_pre_join_t>,
         static_check_t<is_table<Table>::value, assert_from_table_t>,
         static_check_t<required_tables_of_t<Table>::size::value == 0, assert_from_dependency_free_t>,
-        static_check_t<provided_tables_of<Table>::size::value ==
-                           detail::make_name_of_set_t<provided_tables_of<Table>>::size::value,
+        static_check_t<provided_tables_of_t<Table>::size::value ==
+                           detail::make_name_of_set_t<provided_tables_of_t<Table>>::size::value,
                        assert_from_no_duplicates_t>>;
   };
 
diff --git a/include/sqlpp11/core/query/dynamic.h b/include/sqlpp11/core/query/dynamic.h
index e56ad957..d7e34872 100644
--- a/include/sqlpp11/core/query/dynamic.h
+++ b/include/sqlpp11/core/query/dynamic.h
@@ -27,6 +27,7 @@
  */
 
 #include <sqlpp11/core/type_traits.h>
+#include <sqlpp11/core/operator/assign_expression.h>
 #include <sqlpp11/core/operator/sort_order_expression.h>
 #include <sqlpp11/core/operator/enable_as.h>
 #include <sqlpp11/core/to_sql_string.h>
@@ -115,4 +116,13 @@ namespace sqlpp
   {
     return {condition, std::move(t)};
   }
+
+  template <typename TableSpec>
+  struct table_t;
+
+  template <typename TableSpec>
+  auto dynamic(bool condition, table_t<TableSpec> t) -> dynamic_t<table_t<TableSpec>>
+  {
+    return {condition, std::move(t)};
+  }
 }  // namespace sqlpp
diff --git a/include/sqlpp11/core/query/statement.h b/include/sqlpp11/core/query/statement.h
index e587308a..64e4fecc 100644
--- a/include/sqlpp11/core/query/statement.h
+++ b/include/sqlpp11/core/query/statement.h
@@ -78,8 +78,8 @@ namespace sqlpp
       using _all_required_ctes = detail::make_joined_set_t<required_ctes_of<Policies>...>;
       using _all_provided_ctes = detail::make_joined_set_t<provided_ctes_of<Policies>...>;
       using _all_required_tables = detail::make_joined_set_t<required_tables_of_t<Policies>...>;
-      using _all_provided_tables = detail::make_joined_set_t<provided_tables_of<Policies>...>;
-      using _all_provided_outer_tables = detail::make_joined_set_t<provided_outer_tables_of<Policies>...>;
+      using _all_provided_tables = detail::make_joined_set_t<provided_tables_of_t<Policies>...>;
+      using _all_provided_outer_tables = detail::make_joined_set_t<provided_outer_tables_of_t<Policies>...>;
       using _all_provided_aggregates = detail::make_joined_set_t<provided_aggregates_of<Policies>...>;
 
       template <typename Expression>
diff --git a/include/sqlpp11/core/type_traits.h b/include/sqlpp11/core/type_traits.h
index a2d2cba3..0dc4e062 100644
--- a/include/sqlpp11/core/type_traits.h
+++ b/include/sqlpp11/core/type_traits.h
@@ -285,8 +285,6 @@ namespace sqlpp
 
   SQLPP_RECURSIVE_TRAIT_SET_GENERATOR(required_ctes)
   SQLPP_RECURSIVE_TRAIT_SET_GENERATOR(provided_ctes)
-  SQLPP_RECURSIVE_TRAIT_SET_GENERATOR(provided_tables)
-  SQLPP_RECURSIVE_TRAIT_SET_GENERATOR(provided_outer_tables)
   SQLPP_RECURSIVE_TRAIT_SET_GENERATOR(provided_aggregates)
 
   template <typename T>
@@ -325,6 +323,40 @@ namespace sqlpp
 
   static_assert(required_tables_of_t<int>::size::value == 0, "");
 
+  template <typename T>
+  struct provided_tables_of
+  {
+    using type = typename provided_tables_of<nodes_of_t<T>>::type;
+  };
+
+  template <typename... T>
+  struct provided_tables_of<detail::type_vector<T...>>
+  {
+    using type = detail::make_joined_set_t<typename provided_tables_of<T>::type...>;
+  };
+
+  template <typename T>
+  using provided_tables_of_t = typename provided_tables_of<T>::type;
+
+  static_assert(provided_tables_of_t<int>::size::value == 0, "");
+
+  template <typename T>
+  struct provided_outer_tables_of
+  {
+    using type = typename provided_outer_tables_of<nodes_of_t<T>>::type;
+  };
+
+  template <typename... T>
+  struct provided_outer_tables_of<detail::type_vector<T...>>
+  {
+    using type = detail::make_joined_set_t<typename provided_outer_tables_of<T>::type...>;
+  };
+
+  template <typename T>
+  using provided_outer_tables_of_t = typename provided_outer_tables_of<T>::type;
+
+  static_assert(provided_outer_tables_of_t<int>::size::value == 0, "");
+
   template <typename ValueType, typename T>
   struct is_valid_operand
   {
diff --git a/tests/core/types/CMakeLists.txt b/tests/core/types/CMakeLists.txt
index 710119f2..1e8392f5 100644
--- a/tests/core/types/CMakeLists.txt
+++ b/tests/core/types/CMakeLists.txt
@@ -33,8 +33,4 @@ test_compile(result_row)
 test_compile(select_as)
 test_compile(value)
 
-add_subdirectory(aggregate_function)
-add_subdirectory(operator)
-add_subdirectory(clause)
-add_subdirectory(detail)
-add_subdirectory(type_traits)
+add_subdirectory(basic)
diff --git a/tests/core/types/basic/CMakeLists.txt b/tests/core/types/basic/CMakeLists.txt
new file mode 100644
index 00000000..71f0a3c2
--- /dev/null
+++ b/tests/core/types/basic/CMakeLists.txt
@@ -0,0 +1,32 @@
+# Copyright (c) 2024, 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.
+
+function(test_compile name)
+    set(target sqlpp11_core_types_clause_${name})
+    add_executable(${target} ${name}.cpp)
+    target_link_libraries(${target} PRIVATE sqlpp11::sqlpp11 sqlpp11_testing)
+endfunction()
+
+test_compile(join)
+
diff --git a/tests/core/types/basic/join.cpp b/tests/core/types/basic/join.cpp
new file mode 100644
index 00000000..b1e10f07
--- /dev/null
+++ b/tests/core/types/basic/join.cpp
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2024, 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 "Sample.h"
+#include <sqlpp11/sqlpp11.h>
+
+void test_group_by()
+{
+  auto v = sqlpp::value(17);
+  auto foo = test::TabFoo{};
+  auto bar = test::TabBar{};
+
+  // Pre-join
+  static_assert(not sqlpp::is_table<decltype(foo.join(bar))>::value, "");
+
+  // Join
+  {
+    using J = decltype(foo.join(bar).on(foo.id == bar.id));
+    static_assert(sqlpp::is_table<J>::value, "");
+    static_assert(
+        std::is_same<sqlpp::provided_tables_of_t<J>, sqlpp::detail::type_set<test::TabFoo, test::TabBar>>::value, "");
+    static_assert(
+        std::is_same<sqlpp::provided_outer_tables_of_t<J>, sqlpp::detail::type_set<>>::value, "");
+#warning: test the provided dynamic tables of?
+  }
+
+  {
+    using J = decltype(foo.outer_join(bar).on(foo.id == bar.id));
+    static_assert(sqlpp::is_table<J>::value, "");
+    static_assert(
+        std::is_same<sqlpp::provided_tables_of_t<J>, sqlpp::detail::type_set<test::TabFoo, test::TabBar>>::value, "");
+    static_assert(
+        std::is_same<sqlpp::provided_outer_tables_of_t<J>, sqlpp::detail::type_set<test::TabFoo, test::TabBar>>::value, "");
+#warning: test the provided dynamic tables of?
+  }
+
+  // Join with dynamic table
+  {
+    using J = decltype(foo.join(dynamic(true, bar)).on(foo.id == bar.id));
+    static_assert(sqlpp::is_table<J>::value, "");
+    static_assert(
+        std::is_same<sqlpp::provided_tables_of_t<J>, sqlpp::detail::type_set<test::TabFoo, test::TabBar>>::value, "");
+#warning: OUTER is the wrong term. In a left-outer join, the *right* table is the one with optional rows.
+    static_assert(
+        std::is_same<sqlpp::provided_outer_tables_of_t<J>, sqlpp::detail::type_set<>>::value, "");
+#warning: test the provided dynamic tables of?
+  }
+
+
+#warning: Need to add tests with 3 tables
+
+#warning: Need to add tests with CTEs
+}
+
+int main()
+{
+  void test_group_by();
+}
+
+