in deveolper console of salesforce.com error on object name while executing sql query : select pwd_c,sr_c from login_c -

In the Developer Console of force.com, when I execute SQL.com, :

  select pwd_c, sr_c from login_c  

Prefix will be __c in API names in custom objects and fields. Double underscore Note Your sample SOQL query has only one underscore.

See

Coincidentally, there is a great place to ask specific questions of Salesforce.