Function equivalent to RATIO_TO_REPORT in HANA SQL for ratio calculation

Hello All,

I have a select statement where i have to calculate the quantity ratio by dividing each row by the total quantity of all the rows grouping on date field.

We have a function in oracle PL/SQL RATIO_TO_REPORT to achieve this functionality.

Do we have any function similar to this in HANA SQL if we don't have any function how can i achieve this functionality. please guide me.

You can see the functionality in below link used in Oracle PL/SQL..

RATIO_TO_REPORT

Thanks