diff --git a/include/sqlpp11/data_types/text/result_field.h b/include/sqlpp11/data_types/text/result_field.h
index 80f16632..0c0f0d0b 100644
--- a/include/sqlpp11/data_types/text/result_field.h
+++ b/include/sqlpp11/data_types/text/result_field.h
@@ -47,7 +47,7 @@ namespace sqlpp
       size_t len{};
       target._bind_text_result(index, &text, &len);
       this->_value = {text, len};
-      this->_is_null = (len == 0);
+      this->_is_null = (text == nullptr);
     }
 
     template <typename Target>
@@ -57,7 +57,7 @@ namespace sqlpp
       size_t len{};
       target._post_bind_text_result(index, &text, &len);
       this->_value = {text, len};
-      this->_is_null = (len == 0);
+      this->_is_null = (text == nullptr);
     }
   };
 
diff --git a/include/sqlpp11/not_in.h b/include/sqlpp11/not_in.h
index 80676e64..eae91869 100644
--- a/include/sqlpp11/not_in.h
+++ b/include/sqlpp11/not_in.h
@@ -44,7 +44,7 @@ namespace sqlpp
       template <typename T>
       struct _member_t
       {
-        T in;
+        T not_in;
       };
     };
   };
diff --git a/scripts/ddl2cpp b/scripts/ddl2cpp
index c93ac643..208d3369 100755
--- a/scripts/ddl2cpp
+++ b/scripts/ddl2cpp
@@ -233,6 +233,7 @@ else:
 if warnOnParse:
     print(parseError + '. Continuing [-no-warn-on-parse]')
 
+nsList = namespace.split('::')
 
 # PROCESS DDL
 tableCreations = ddl.parseFile(pathToDdl)
@@ -246,8 +247,9 @@ print('#include <' + INCLUDE + '/table.h>', file=header)
 print('#include <' + INCLUDE + '/data_types.h>', file=header)
 print('#include <' + INCLUDE + '/char_sequence.h>', file=header)
 print('', file=header)
-print('namespace ' + namespace, file=header)
-print('{', file=header)
+for ns in nsList:
+    print('namespace ' + ns, file=header)
+    print('{', file=header)
 DataTypeError = False
 for create in tableCreations:
     sqlTableName = create.tableName
@@ -322,7 +324,8 @@ for create in tableCreations:
     print('    };', file=header)
     print('  };', file=header)
 
-print('}', file=header)
+for ns in nsList:
+    print('} // namespace ' + ns, file=header)
 print('#endif', file=header)
 if (DataTypeError):
     print("Error: unsupported datatypes." )
diff --git a/test_serializer/As.cpp b/test_serializer/As.cpp
index 76c4dcfa..709148c1 100644
--- a/test_serializer/As.cpp
+++ b/test_serializer/As.cpp
@@ -44,5 +44,12 @@ int As(int, char* [])
   compare(__LINE__, (count(foo.omega) - bar.alpha).as(cheese), "(COUNT(tab_foo.omega)-tab_bar.alpha) AS cheese");
   compare(__LINE__, (count(foo.omega) - uint32_t(17)).as(cheese), "(COUNT(tab_foo.omega)-17) AS cheese");
 
+  // Auto alias
+  compare(__LINE__, select(max(bar.alpha)), "SELECT MAX(tab_bar.alpha) AS max_");
+  compare(__LINE__, select(max(bar.alpha).as(cheese)), "SELECT MAX(tab_bar.alpha) AS cheese");
+  compare(__LINE__, select(max(bar.alpha)).from(bar).unconditionally().as(cheese),
+          "(SELECT MAX(tab_bar.alpha) AS max_ FROM tab_bar) AS cheese");
+  compare(__LINE__, select(max(bar.alpha)).from(bar).unconditionally().as(cheese).max, "cheese.max_");
+
   return 0;
 }