Query Fields Empty

[Amar]

Hi,

I built an Infopath form using a web service as a datasource.
This web service connects to a database and returns the dataset.

I can see all the data fields but most of the data fields are marked as
required fields. How to control which fields to be marked as required and
which one not as required.

The other question is in Query Fields, I do not see any fields and when I
click the Run Query button, it returns all the rows from the database. How to
define the query fields.

Any help is appreciated. Thanks in advance.