InfoPath Dev

How can I change the "Created by", "Modified by" fiels to show the Name in my Workflow, not the user account in the format of DOMAIN\ALIAS.

I had two field in my <queryFields> that I'm using to sum values in some of my <dataFields>. The fieldX in <dataFields> is using the formula (queryField_field01 / queryField_field02); fieldX is betweet 0 and 1.

Hello and thanks for your answer. I added a secondary data source but the fields don't allow me to change the type. My Form template is based on a Microsoft SQL Server database, the fields and groups in data sources are based on data connections to external data sources; I cannot modify those.  

I have a data source that is reading fields from a SQL database. When I insert a control from the datasource, the attribute field from the textbox control that I am adding is defaulted to simpleType, but in my database table the field is Decimal. I need to change the default control in Infopath from simpleType to Decimal. Please explain how I can ...