Changing the RoR SQL call to NAME instead of *

Being that it is better to call a SQL database with the specific item, for example:

Bad:

SELECT * FROM tblUsers

Good:

SELECT email FROM tblUsers

How would I do this in开发者_如何学运维 RoR to make it explicitly perform the latter example?

Assuming your tblUsers table is used by User model, you should do

User.all(:select => "email")