Abhay,
....| selfjoin []* gives you a join on the selected field(s). The options are useful (overwrite, max or keepsingle. That allows control over values in the selected fields. Note the default on 'max' vs zero.
There's more at http://docs.splunk.com/Documentation/Splunk/5.0/SearchReference/Selfjoin
The example used is ... | selfjoin id...which may start you off with results. Depends what you are trying to do after that 😉
