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nareshnaresh 

by using data loader i need to update a field with out 'id'. can we do this????

PratikPratik (Salesforce Developers) 
Hi Naresh,

To perform Update operation you will need to have ID field.

In dataloader, Id is not required for Insert operation.

Can you describe the scenario for updation of records.

Thanks,
Pratik
Ajith G 4Ajith G 4
you can't update the field value with out ID.
nareshnaresh
may be we can update a field by external id in data loader
PratikPratik (Salesforce Developers) 
Hi Naresh,

You can do upsert using external id.

You can refer this:
http://www.salesforce.com/us/developer/docs/dataLoader/Content/inserting_updating_or_deleting_data.htm

Thanks,
Pratik

P.S. If this answers you question, please mark it as "Best Answer" so it will help other community members too.
 
PratikPratik (Salesforce Developers) 
Hi Naresh,

Data Loader Actions:
Insert
Loads data from a data source into Salesforce as new records.

Update
Loads data from a data source into Salesforce, where existing records with matching ID fields are updated.

Upsert
Loads data from a data source into Salesforce, where existing records with a matching custom external ID field are updated; records
without matches are inserted as new records.

Delete
Loads data from a data source into Salesforce, where existing records with matching ID fields are deleted

Thnaks,
Pratik