APEX

Hello Experts,

I have an application where I have created the classic report based on SQL query

Select summary_id,
  APEX_ITEM.HIDDEN(1,summary_id)||
  APEX_ITEM.TEXT(2,attribute5) attribute5,
from summary;

Here summary__id and attribute 5 are number data type.

1. I have seven (7 rows) records, where I want to make 5th and 7th record(which are Sub total and total) as read only.
2. I want to dynamically calculate the sub total and total based on change of values in previous rows and write it into the database.

Thank you.

I am using Oracle apex 4.2 version.