You need to use quotes around the fieldname:

select "User_ID", "Username", "Full Name", "E-mail" from SECURITY_USERS_VW where "Active" = 'Yes'


In Biotics 6, this view has been expanded to reflect the User Groups each user is assigned to. So, for example, you could determine your Biotics Administators by running the following query: 

select * from security_users_vw where "Active" = 'Yes' and "Groups" like '%Administrators%'