Hi Ram,
A nice introductory example ("Joe the plumber") is given in the official
documentation :
http://docs.couchdb.org/en/1.6.1/intro/why.html#a-better-fit-for-common-applications
I would also recommend you to look at the "banking recipe" in the (outdated)
CouchDB book, it helped me a lot in understanding the difference between
MapReduce approach (store as it comes and index/aggregate later) and the
relational approach.
http://guide.couchdb.org/draft/recipes.html#banking
Regards,
Aurélien
