Hello Srikanta,
Cloud SQL offers the option to import CSV files into your database, you may refer to
this page for more details. In your case, using the
REST API method would work best, you will need to create a bucket and set the appropriate permissions. Once that is set up, you may then start sending import requests using
the provided curl command for Linux machines.
I hope that this helps point you in the right direction, however you may want to refer to Stack Exchange for how-to and technical questions as the answer-question format on those sites will give your question greater visibility. Google Groups are generally reserved for discussions and opinions about Google products.