How column wise read and delete is done for delta data ?

Hi to all,

What is knew is that HANA is optimized for column wise insert.

I have one doubt.

Example: i have 2 field in table1 in HANA,and stored record in column wise.

                  NAME    Marks

                    T         20

                    C        30

now if Name T, marks changes from 20 to 30, so as its column wise storage, so there will be no update, but new record will be inserted for T to table1.

                  NAME    Marks

                    T         20

                    C        30

                    T         30

but if i will read table1 for name T, i will get T 20 and T 30 as record, which is not be correct, as latest record will be T 30.

So how SAP HANA will read the correct record for such cases.

Also how delete will work for column wise storage.

I shall be thankful to you for this.

Regards

Pavneet Rana