Hi Kamal,
You can refer to HANA Developer Guide, Modeling Guide, SQL Guide and other guides from the below link:
http://help.sap.com/hana_appliance#section5
Especially in Developer Guide, you will find everything explained in detail and with examples:
If you want OpenSAP Exercise Codes:
You have to import SAP HANA EPM Demo Delivery unit to your System, for the content and how to import, follow this guide:
http://help.sap.com/openSAP/HANA1/openSAP_HANA1_Week_01_How_to_Import_Delivery_Units.pdf
After the Delivery Units have been successfully imported, go to Repositories tab, you will find a folder called "workshop" - R-Click on it and select "Checkout and Import Project"
This will import it and activate it.
Go to Project Explorer tab to see if its been imported successfully.
After that you can access all OpenSAP Exercises using following link:
http://hostname/8000:workshop/admin/ui/exercises/WebContent/index.html
Regards,
Vivek