---
title: "Dummy named column in source table"
canonical: "https://docs.vaultspeed.com/space/VPD/3320775176/Dummy%20named%20column%20in%20source%20table"
format: markdown
---
It is possible that a source table contains a column with the name “dummy".   
This can give issues with VaultSpeed ETL/DDL generations.   
In the extract and stage layer, an internal system column can be added depending on parameters to determine the first record in a historical dataset. This internal column is based on a system parameter with the name “DATA_ORDER”. 

The default for this parameter is “dummy” which determines the name of the internal system column. 

If this name conflicts with a column in the source table with the same name, the parameter “DATA_ORDER” must be set to a name that is not used in the source tables.

This also applies to all other attribute names in the parameter section of ‘Temporary Attribute Names’.

> ℹ️ It is a common practice to rename these Temporary Attribute Names in the parameters to something truly unique that you won’t encounter on your own database (eg: prefix all these attributes with VSP_ indicating that they are generated by VaultSpeed)