>Hello, my name is Nancy Ramirez I am going to develop to a point of sale with visual basic.net, however I don´t know what database use, because that point of sale is going to work in each branch of way (monousuary) and that same point of sale from a server (for several users). Some friends have recommended to me to use oracle or pervasive. but If I use oracle , I should have a license for each branch?
>Somebody can help me?

You can use SQL Server Desktop Edition (also known as MSDE):

http://www.microsoft.com/sql/msde/default.asp

This is a version of SQL Server with some restrictions, such as the size of a database (2GB).