Hi Monissha,
In SAP HANA, data is stored as either column based or row based in the tables.HANA is a column oriented database (also called as C-stores) stores the content column wise rather than by row. It is very useful in data compression, Storing data by column results in better compression than the conventional row store. It also performs well while query processing since queries read only the columns which are required.
You can also go through the link.
I hope this helps,
Cheers,
Sumit