What kind a SQL query use rails to retrieve data in console
<p>When I fire <code>User.first.email</code> in Rails - 4 console it gives me query like 
<code>SELECT  "users".* FROM "users"  ORDER BY "users"."id" ASC LIMIT 1</code> 
By this query structure how it can get <code>email</code> column from database just only firing <code>SELECT  "users".* FROM "users"</code> in rails.
Please provide needful description for this.</p>