Question

I have simple report (not interactive). When I try to remove column from its backing sql query it throws an exception

ORA-01476: divisor is equal to zero

UPD: exception is thrown after I try to remove a.page_name and save report

select a.page_name,a.page_id, b.report_name
from APEX_WORKSPACE_ACTIVITY_LOG a, reports b, APEX_APPLICATION_PAGE_IR c
where 
c.interactive_report_id = b.interactive_report_id
and c.page_id = a.page_id
and a.apex_user = :APP_USER --NVL(v('APP_USER'), USER)
and a.application_id = '157'

Answer 1

I suspect the column you are removing is being used somewhere.
Try exporting the application and grepping the file for page_name