SELECT Name, ProfileId, Id, Username FROM User this is the select query to retrive data in Force.com explorer
Now I wan't to update a column how can I do this? update key word it self not working here please give the solution for this. thanks in advance
In Salesforce you not write to update query same as in SQL.
Please use update method to update column of an object.
More information and sample please read following documents.
https://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_update.htm