diff --git a/src/baseexpression.cpp b/src/baseexpression.cpp
index b37ad9f..3499f47 100644
--- a/src/baseexpression.cpp
+++ b/src/baseexpression.cpp
@@ -123,11 +123,11 @@ void BaseExpression::field_after()
 }
 
 
-void BaseExpression::put_field_name(const wchar_t * field_name)
+void BaseExpression::put_field_name(const wchar_t * field_name, bool add_column_prefix)
 {
 	before_field_name();
 
-	if( !column_prefix.empty() )
+	if( add_column_prefix && !column_prefix.empty() )
 	{
 		esc(column_prefix, *out_stream);
 		(*out_stream) << '.';
diff --git a/src/baseexpression.h b/src/baseexpression.h
index 509084c..13c4a88 100644
--- a/src/baseexpression.h
+++ b/src/baseexpression.h
@@ -62,7 +62,7 @@ public:
 	virtual void generate_from_model(PT::TextStream & stream, Model & model);
 
 	template<typename FieldValue>
-	void field(const wchar_t * field_name, const FieldValue & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
+	void field(const wchar_t * field_name, const FieldValue & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false, bool add_column_prefix = true)
 	{
 		if( out_stream && can_field_be_generated(insertable, updatable, is_primary_key) )
 		{
@@ -70,7 +70,7 @@ public:
 
 			if( work_mode == MORM_WORK_MODE_MODEL_FIELDS )
 			{
-				put_field_name(field_name);
+				put_field_name(field_name, add_column_prefix);
 			}
 			else
 			if( work_mode == MORM_WORK_MODE_MODEL_VALUES )
@@ -90,12 +90,12 @@ public:
 	}
 
 	template<typename FieldValue>
-	void field(const PT::TextStream & field_name, const FieldValue & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
+	void field(const PT::TextStream & field_name, const FieldValue & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false, bool add_column_prefix = true)
 	{
 		std::wstring field_name_str; // field() methods can be called recursively, so don't make it as class object
 		field_name.to_string(field_name_str);
 
-		return field(field_name_str.c_str(), field_value, insertable, updatable, is_primary_key);
+		return field(field_name_str.c_str(), field_value, insertable, updatable, is_primary_key, add_column_prefix);
 	}
 
 	template<typename FieldValue>
@@ -245,7 +245,7 @@ protected:
 
 	//void field(const wchar_t * field_name, Model & field, bool insertable = true, bool updatable = true);
 
-	virtual void put_field_name(const wchar_t * field_name);
+	virtual void put_field_name(const wchar_t * field_name, bool add_column_prefix = true);
 
 	template<typename FieldValue>
 	void put_field_value(const FieldValue & field_value)
diff --git a/src/dbexpression.h b/src/dbexpression.h
index f9b5341..3de17b7 100644
--- a/src/dbexpression.h
+++ b/src/dbexpression.h
@@ -68,7 +68,7 @@ public:
 		PT::TextStream column_expression;
 		column_expression << new_column_expression << " as " << new_column_name;
 
-		field(column_expression, field_value, false, false);
+		field(column_expression, field_value, false, false, false, false);
 	}