added common SQL data types like binary and bit

include/sqlpp11/data_types/boolean/data_type.h

@@ -39,6 +39,8 @@ namespace sqlpp
     template <typename T>
     using _is_valid_operand = is_boolean_t<T>;
   };
+
+  using bit = sqlpp::boolean;
 }
 
 #endif

include/sqlpp11/data_types/day_point/data_type.h

@@ -42,5 +42,7 @@ namespace sqlpp
     template <typename T>
     using _is_valid_assignment_operand = is_day_point_t<T>;
   };
+
+  using date = day_point;
 }
 #endif

include/sqlpp11/data_types/text/data_type.h

@@ -43,5 +43,7 @@ namespace sqlpp
   using blob = text;
   using varchar = text;
   using char_ = text;
+  using binary = text;
+  using varbinary = text;
 }
 #endif

include/sqlpp11/data_types/time_point/data_type.h

@@ -40,5 +40,9 @@ namespace sqlpp
     template <typename T>
     using _is_valid_operand = is_day_or_time_point_t<T>;
   };
+
+  using datetime = time_point;
+  using timestamp = time_point;
+  using time = time_point;
 }
 #endif