diff --git a/include/sqlpp11/basic_expression_operators.h b/include/sqlpp11/basic_expression_operators.h
index fc54a876..7c7d3ec8 100644
--- a/include/sqlpp11/basic_expression_operators.h
+++ b/include/sqlpp11/basic_expression_operators.h
@@ -115,12 +115,12 @@ namespace sqlpp
 				return { *static_cast<const Base*>(this) };
 			}
 
-			sort_order_t<Base, sort_type::asc> asc()
+			sort_order_t<Base, sort_type::asc> asc() const
 			{ 
 				return { *static_cast<const Base*>(this) };
 			}
 
-			sort_order_t<Base, sort_type::desc> desc()
+			sort_order_t<Base, sort_type::desc> desc() const
 			{ 
 				return { *static_cast<const Base*>(this) };
 			}
@@ -145,7 +145,7 @@ namespace sqlpp
 		struct alias_operators
 		{
 			template<typename alias_provider>
-				expression_alias_t<Base, alias_provider> as(const alias_provider&)
+				expression_alias_t<Base, alias_provider> as(const alias_provider&) const
 				{
 					return { *static_cast<const Base*>(this) };
 				}
diff --git a/include/sqlpp11/column.h b/include/sqlpp11/column.h
index 9f9a089a..1ecbeb73 100644
--- a/include/sqlpp11/column.h
+++ b/include/sqlpp11/column.h
@@ -90,7 +90,7 @@ namespace sqlpp
 			auto operator =(T t) const -> assignment_t<column_t, wrap_operand_t<T>>
 			{
 				using rhs = wrap_operand_t<T>;
-				static_assert(_is_valid_operand<rhs>::value, "invalid rhs operand assignment operand");
+				static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
 				return { *this, {rhs{t}} };
 			}
diff --git a/include/sqlpp11/integral.h b/include/sqlpp11/integral.h
index ecb9b14d..0e509bbf 100644
--- a/include/sqlpp11/integral.h
+++ b/include/sqlpp11/integral.h
@@ -205,7 +205,7 @@ namespace sqlpp
 						using rhs = wrap_operand_t<T>;
 						static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
-						return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
+						return { *static_cast<const Base*>(this), {{*static_cast<const Base*>(this), rhs{t}}}};
 					}
 
 				template<typename T>
@@ -214,7 +214,7 @@ namespace sqlpp
 						using rhs = wrap_operand_t<T>;
 						static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
-						return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
+						return { *static_cast<const Base*>(this), {{*static_cast<const Base*>(this), rhs{t}}}};
 					}
 
 				template<typename T>
@@ -223,7 +223,7 @@ namespace sqlpp
 						using rhs = wrap_operand_t<T>;
 						static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
-						return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
+						return { *static_cast<const Base*>(this), {{*static_cast<const Base*>(this), rhs{t}}}};
 					}
 
 				template<typename T>
@@ -232,7 +232,7 @@ namespace sqlpp
 						using rhs = wrap_operand_t<T>;
 						static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
-						return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
+						return { *static_cast<const Base*>(this), {{*static_cast<const Base*>(this), rhs{t}}}};
 					}
 			};
 	};
diff --git a/include/sqlpp11/table.h b/include/sqlpp11/table.h
index 52f747f3..06a1c2f5 100644
--- a/include/sqlpp11/table.h
+++ b/include/sqlpp11/table.h
@@ -62,31 +62,31 @@ namespace sqlpp
 
 
 		template<typename T>
-			join_t<inner_join_t, Table, T> join(T t)
+			join_t<inner_join_t, Table, T> join(T t) const
 			{
 				return { *static_cast<const Table*>(this), t };
 			}
 
 		template<typename T>
-			join_t<inner_join_t, Table, T> inner_join(T t)
+			join_t<inner_join_t, Table, T> inner_join(T t) const
 			{
 				return { *static_cast<const Table*>(this), t };
 			}
 
 		template<typename T>
-			join_t<outer_join_t, Table, T> outer_join(T t)
+			join_t<outer_join_t, Table, T> outer_join(T t) const
 			{
 				return { *static_cast<const Table*>(this), t };
 			}
 
 		template<typename T>
-			join_t<left_outer_join_t, Table, T> left_outer_join(T t)
+			join_t<left_outer_join_t, Table, T> left_outer_join(T t) const
 			{
 				return { *static_cast<const Table*>(this), t };
 			}
 
 		template<typename T>
-			join_t<right_outer_join_t, Table, T> right_outer_join(T t)
+			join_t<right_outer_join_t, Table, T> right_outer_join(T t) const
 			{
 				return { *static_cast<const Table*>(this), t };
 			}
diff --git a/include/sqlpp11/table_alias.h b/include/sqlpp11/table_alias.h
index 7cc58a9f..94ea6716 100644
--- a/include/sqlpp11/table_alias.h
+++ b/include/sqlpp11/table_alias.h
@@ -54,7 +54,7 @@ namespace sqlpp
 		static_assert(required_tables_of<Table>::size::value == 0, "table aliases must not depend on external tables");
 
 		using _name_t = typename AliasProvider::_name_t;
-		using _column_tuple_t = std::tuple<column_t<Table, ColumnSpec>...>;
+		using _column_tuple_t = std::tuple<column_t<AliasProvider, ColumnSpec>...>;
 
 		table_alias_t(Table table):
 			_table(table)
diff --git a/include/sqlpp11/text.h b/include/sqlpp11/text.h
index d707d5a1..7dda39a8 100644
--- a/include/sqlpp11/text.h
+++ b/include/sqlpp11/text.h
@@ -150,7 +150,7 @@ namespace sqlpp
 						using rhs = wrap_operand_t<T>;
 						static_assert(_is_valid_operand<rhs>::value, "invalid rhs assignment operand");
 
-						return { *static_cast<const Base*>(this), { *static_cast<const Base*>(this), rhs{t} } };
+						return { *static_cast<const Base*>(this), concat_t<Base, wrap_operand_t<T>>{ *static_cast<const Base*>(this), rhs{t} } };
 					}
 			};
 	};
diff --git a/test_constraints/must_not_update.cpp b/test_constraints/must_not_update.cpp
new file mode 100644
index 00000000..42f9ac04
--- /dev/null
+++ b/test_constraints/must_not_update.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2013-2014, 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 "MockDb.h"
+#include <sqlpp11/update.h>
+
+MockDb db;
+
+int main()
+{
+	test::TabBar t;
+
+	update(t).set(t.alpha = 7, t.gamma = false, t.beta = "alpha must not be set");
+}
diff --git a/tests/MockDb.h b/tests/MockDb.h
index 5ef1f110..0586c04c 100644
--- a/tests/MockDb.h
+++ b/tests/MockDb.h
@@ -165,8 +165,6 @@ struct MockDbT: public sqlpp::connection
 	template<typename PreparedInsert>
 		size_t run_prepared_insert(const PreparedInsert& x)
 		{
-			_serializer_context_t context;
-			::sqlpp::serialize(x, context);
 			return 0;
 		}
 
@@ -181,8 +179,6 @@ struct MockDbT: public sqlpp::connection
 	template<typename PreparedSelect>
 		result_t run_prepared_select(PreparedSelect& x)
 		{
-			_serializer_context_t context;
-			::sqlpp::serialize(x, context);
 			return {};
 		}
 
diff --git a/tests/UpdateTest.cpp b/tests/UpdateTest.cpp
index 04f73024..e12224ec 100644
--- a/tests/UpdateTest.cpp
+++ b/tests/UpdateTest.cpp
@@ -68,6 +68,8 @@ int main()
 	db(update(t).set(t.delta = sqlpp::null).where(true));
 	db(update(t).set(t.delta = sqlpp::default_value).where(true));
 
+	db(update(t).set(t.delta += t.alpha * 2, t.beta += " and cake").where(true));
+
 
 	return 0;
 }